单选集
单选集
Lots of creatures already reproduce without sex. Since the birth of Louise Brown, the first test-tube baby, in 1978, (1) of human beings (2) in laboratory glassware rather than in bed.
If human cloning becomes possible—and since the birth of a sheep called Dolly, (3) doubt that it will be feasible to clone a person by 2025—even the link between sex organs and reproduction (4) . You will then be able to take a cutting from your body and grow a new person, (5) you were a willow tree.
(6) , we have already divorced sex from reproduction. In the 1960s, the contraceptive pill freed women to enjoy sex for its own sake. (7) , greater tolerance of homosexuality signaled society’s acceptance of nonreproductive sex of another sort. These changes are only continuations of a (8) that started perhaps a million years ago.
Human beings (9) the interest in infertile, social sex with a few other species: dolphins, apes and some birds. But (10) sex is too good for human beings to (11) , more and more people will abandon it as a (12) of reproduction.
In the modern world, you can (13) have sex and parenthood without suffering the bit (14) . Some Hollywood actresses (15) the urge for mothering by electing to adopt children (16) spoil their figures (as they see it) by childbearing. For people as beautiful as this, the temptation to (17) a clone (reared in a surrogate womb) could one day be (18) .
However, human cloning and designer babies are probably not (19) . Even assuming that the procedures are judged safe and efficient in farm animals, still a long way off, they will be heavily (20) , if not banned, by many governments for human beings.
A:as B:if C:even D:even if
The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, al though nobody knows exactly when acquired the use of (1) .
The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man i, apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great day (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably-picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practiced. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided.
A:even if B:even C:even though D:even as
The first two stages in the development of civilized man were probably the invention of primitive weapons and the discovery of fire, although nobody knows exactly when people acquired the use of (1) .
The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man is apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great clay (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man.
Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practised. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided.
A:even if B:even C:even though D:even as
| The first two stages in the development
of civilized man were probably the invention of primitive weapons and the
discovery of fire, although nobody knows exactly when people acquired the use
of (1) . The (2) of language is also obscure. No doubt it began very gradually. Animals have a few cries that serve (3) signals, (4) even the highest apes have not been found able to pronounce words (5) with the most intensive professional instruction. The superior brain of man is apparently (6) for the mastering of speech. When man became sufficiently intelligent, we must suppose that he (7) the number of cries for different purposes. It was a great clay (8) he discovered that speed could be used for narrative. There are those who think that (9) picture language preceded oral language. A man (10) a picture on the wall of his cave to show (11) direction he had gone, or (12) prey he hoped to catch. Probably picture language and oral language developed side by side. I am inclined to think that language (13) the most important single factor in the development of man. Two important stages came not (14) before the dawn of written history. The first was the domestication of animals; the second was agriculture. Agriculture was (15) in human progress to which subsequently there was nothing comparable (16) our own machine age. Agriculture made possible (17) immense increase in the number of the human species in the regions where it could be successfully practised. (18) were, at first, only those in which nature fertilized the soil (19) each harvest. Agriculture met with violent resistance from the pastoral nomads, but the agricultural way of life prevailed in the end (20) the physical comforts it provided. |
A:even if B:even C:even though D:even as
(Even if) automakers modify commercially produced cars to run (on) alternative (fuels), the cars won’t catch on in big way (when) drivers can fill them up at the gas station.
A:Even if B:on C:fuels D:when
He (will) not (borrow) you the money (even) if you (ask).（ ）
A:will B:borrow C:even D:ask
Directions: There are 20 blanks in the following passage. For each
blank there are 4 choices marked A, B, C and D be low the passage. You should
choose the one that best fits into the passage. Then write the corresponding
letter on the Answer Sheet.
| Trees are useful to man (61)
three very important ways: they provide him (62)
wood and other produces; they help to check soil erosion and they help to
(63) drought and floods. (64) , in many parts of the world, man has not realized that the (65) of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large (66) , only to find that (67) them he has lost the best friend he had. Two (68) years ago a rich and powerful country cut down its trees to build warships (69) to gain itself an empire. It gained the empire, but without its trees, its soil became hard and poor. When the empire (70) to pieces, the home country found itself faced by floods and starvation. (71) a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this ,the villager wants wood to cook his food (72) ; and he can earn money by making charcoal or selling wood to the townsman. He is usually too lazy or too (73) to plant and look after new trees. So, (74) the government has a good system of control, or can educate the people, the forests slowly disappear. This does not only mean that the villagers’ sons and grandsons have (75) trees. The results are even more serious; for where there are trees their roots break the soil up allowing the rain to sink in-and also bind the soil, thus preventing (76) washed away on the surface, causing floods and carrying away (78) it the rich top-soil, in which crops grow so well. When all the top-soil is (79) , nothing remains (80) worthless desert. |
A:Even B:Even where C:Even then D:Even now
Teaching and Learning Many teachers believe that the responsibilitiesfor learning lie with the student. If a long reading assignment is given,instructors expect student to be (51)____ with the information in thereading even if they do not discuss it in class or (52)____ an examination. The idealstudent is (53)____ to be one who is motivated to learn for the sake oflearning, not the one interested only in getting high (54)____ . Sometimes homeworkis returned with brief written (55)____ but without a grade. Even if agrade is not given, the student is (56)____ for learning the materialassigned. When research is (57)____ , the professor expects the studentto take it actively and to complete it with minimum (58)____ . It is thestudent’s responsibility to find books, magazines, and articles in the library.Professors do not have the time to (59)____ how a university libraryworks; they expect students particularly graduate students to exhaust the (60)____ sources in the library. Professors will help students whoneed it, (61)____ prefer that their students should not be too (62)____ on them. In the United States professors have many other (63)____ besides teaching, such as administrative or research work. Therefore, the time that aprofessor can spend (64)____ a student outside of class is limited. If astudent has problems with classroom work, the student should either (65)____ a professor during office hours or make an appointment.
A:but B:even C:thus D:and
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