单项选择
单项选择
Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live, Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.
Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called mycorrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon. With a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment./
A:popular B:common C:ordinary D:widespread
Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.
Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment./
A:popular B:common C:ordinary D:widespread
Directions:
Read the following text. Choose the best word(s) for
each numbered blank and mark A, B, C or D on ANSWER SHEET 1.
| Most plants can make their own food
from sunlight, (1) some have discovered that stealing is an
easier way to live, Thousands of plant species get by (2)
photosynthesizing, and over 400 of these species seem to live by
pilfering sugars from an underground (3) of fungi(真菌). But
in (4) a handful of these plants has this modus operandi been
traced to a relatively obscure fungus. To find out how (5)
are (6) , mycologist Martin Bidartondo of the
University of California at Berkeley and his team looked in their roots. What
they found were (7) of a common type of fungus, so
(8) that it is found in nearly 70 percent of all plants. The
presence of this common fungus in these plants not only (9)
at how they survive, says Bidartondo, but also suggests that
many ordinary plants might prosper from a little looting, too. Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called mycorrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon. With a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment." |
A:popular B:common C:ordinary D:widespread
Directions:
Read tile following text. Choose the best
word(s) for each numbered blank and mark A, B, C or D on ANSWER SHEET 1.
| Most plants can make their own food
from sunlight, (1) some have discovered that stealing is an
easier way to live. Thousands of plant species get by (2)
photosynthesizing, and over 400 of these species seem to live by pilfering
sugars from an underground (3) of fungi(真菌). But in
(4) a handful of these plants has this modus operandi been
traced to a relatively obscure fungus. To find out how (5)
are (6) , mycologist Martin Bidartondo of the University of
California at Berkeley and his team looked in their roots. What they found were
(7) of a common type of fungus, so (8)
that it is found in nearly 70 percent of all plants. The presence of this common
fungus in these plants not only (9) at how they survive,
says Bidartondo, but also suggests that many ordinary plants might prosper from
a little looting, too. Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment." |
A:popular B:common C:ordinary D:widespread
According to myth, Rwanda’s ancient line of kings descended from a man with secret knowledge: He could (1) ordinary rock into smooth, gleaming iron. (2) this new technology, he taught his people to make hard, durable weapons for defeating their enemies and sharp axes for cutting the forest to make fields. By the time the first Europeans arrived in the 19th century, iron had become (3) in the kingdom of Rwanda.
Other traditional African societies tell stories of (4) ironworkers who descended from heaven or came from other lands. The prevalence of such legends (5) the importance of ironworking in these cultures, and archaeologists have long wondered if the arrival of iron metallurgy (6) the growth of complex early societies. Did foreigners (7) bring ironworking to Africa, or did Africans invent it themselves
Entering the Iron Age was not easy. Metalworkers had to melt ore at (8) temperatures and then repeatedly hammer and reheat the spongy metal. The traditional view is that metallurgists in Turkey were the first to melt iron ore (9) , beginning around 1800 B.C.E. Initially, they (10) the new metal for precious (11) or ritual objects. But by 1200 B.C.E., workers in the Levant were boiling out (12) amounts of iron.
The metal had a major (13) on societies. Iron was a transformative metal. Iron ores are much more (14) than copper or the tin needed to make bronze. Bronze was (15) costly and largely limited (16) use in ritual objects and goods for (17) . But once cultures learned to melt iron, they could put iron tools into the hands of (18) people for clearing forests and tilling the (19) . This boosted agricultural yields, increased the numbers of villages, and (20) ever more social complexity.
A:countless B:ordinary C:folk D:unarmed
Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.
Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment./
A:popular B:common C:ordinary D:widespread
On television all over the world there are programmes about the work of the police. They are popular because they are usually very exciting. In London there is a television programme called "Police Five" --because it is on for five minutes once a week. A television reporter, Shaw Taylor, talks about crimes in the London area. He asks for public help. The police station needs the help of ordinary people because sometimes you or I have information that can be useful to the police.
Shaw Taylor shows pictures of paintings, jewellery (珠宝) and other things which thieves stole during the week. Sometimes he shows the car that the thieves escaped in. When people see men or things on the television programme which they may remember, they can tell the police where they saw them. With their help the police may catch more criminals.
Sometimes the police find a car or some money. Shaw Taylor shows them on television. The owners sometimes see them. Then they can telephone the police and say, "Thank you very much -- that’s mine!/
The police station asks for public help because ______.
A:ordinary people like the television programme B:ordinary people are interested in pictures of paintings, jewellery, etc. C:the policemen can not catch the thieves themselves D:ordinary people may help the policemen get useful information about the criminals
阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
| ? ? Energy equals mass times the speed of
light squared. This is the famous equation of Albert Einstein. It{{U}} ?(51)
?{{/U}}to the category of the theory of relativity, and it equates energy
with mass. ? ?All things are made up of atoms. When{{U}} ?(52) ?{{/U}}of an atom travels at almost the speed of light{{U}} ?(53) ?{{/U}}we put more energy into it to increase the speed, it begins to in crease in mass. The energy that makes it travel fast cannot make it travel{{U}} ?(54) ?{{/U}}the speed of light—nothing{{U}} ?(55) ?{{/U}}light can travel that fast- so the energy goes into the thing{{U}} ?(56) ?{{/U}}and increases its mass. Energy{{U}} ?(57) ?{{/U}}into mass. ? ?Why is the theory called the theory of relativity? A thing that is relative depends upon{{U}} ?(58) ?{{/U}}else to identify it or to define it. In relativity theory we identify or define mass, time, and length{{U}} ?(59) ?{{/U}}to the speed of light. ? ?When something is at rest, it looks{{U}} ?(60) ?{{/U}}in length. However, when it travels at almost the speed of light, it becomes{{U}} ?(61) ?{{/U}}. Time also changes. However, the change in time is{{U}} ?(62) ?{{/U}}to the change in length. The length of a thing becomes short{{U}} ?(63) ?{{/U}}time becomes long. ? ?If you want to{{U}} ?(64) ?{{/U}}young, relative to a friend, take a trip in a spaceship that travels at{{U}} ?(65) ?{{/U}}the speed of light. And, although time and heartbeat seem ordinary to you in the spaceship, when you return, look at your friend; Relative to you, he or she is old. |
A:usual B:common C:ordinary D:universal
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