对于引起HO的原因，下面哪些描述是正确的（）。

A:Better cell HO B:Emergency HO C:Low battery HO D:Power budget HO

Researchers have found that migrating animals use a variety of inner compasses to help them navigate. Some (1) by the position of the Sun. Others navigate by the stars. Some use the Sun as (2) guide during the day, and then (3) to star navigation by night. One study shows that the homing pigeon uses the Earth’s magnetic fields as a guide (4) finding its way home, and there are indications that various other animals, from insects to mollusks (软体动物), can also make (5) of magnetic compasses. (6) is of course very useful for a migrating bird to be able to switch to magnetic compass when clouds cover the sun; (7) it Would just have to land and wait for the Sun to come out again. (8) with the Sun or stars to steer by, the problems of navigation are more complicated (9) they might seem at first. For example, a worker honeybee (10) has found a rich source of nectar and pollen flies rapidly home to the hive to (11) : A naturalist has discovered that the bee scout (12) her report through complicated dance in the hive, (13) she tells the other workers not only how far away the food is, but also what direction to fly in (14) to the Sun. (15) the Sun does not stay in one place all day. As the workers start (16) to gather the food, the Sun may (17) have changed its position in the sky somewhat. In later trips during the day, the Sun seems to move farther and farther toward the west. Yet the worker bees seem to have no (18) at all in finding the food source. Their inner (19) tell them just where the Sun will be, and they change their course (20) .

A:how B:why C:in which D:in this way

More and more of us are (1) the TV networks. That’ s not news, of course; there have been countless stories on their (2) audience. But I didn’ t realize how far out ! had dropped (3) I glanced at the Nielsen ratings of the top 71 shows. Of those 71 programs, I had not watched (4) one. (5) , I could count only five that I had ever seen in my entire life. And of those five, there isn’ t one I watch (6) .
Despite its popularity, I don’ t like happy family shows. They’ re (7) . If I watch a family show, I prefer something lifelike, such as "Death’ of a Salesman."
(8) the second - rated program, "A Different World," I’ ve never heard of it. If I want to see a different (9) , I’ ll drive to the west side of Chicago.
I (10) watch" Cheers," which is still (11) the top ten, but gave it up after Diana left and Sam began lusting after a career- crazed yuppie. Am I the only person in America who has never watched a segment of "Dallas" A while ago, I recall somebody important was killed on the "last (12) of the season and almost everybody in America was caught up in the hype. I watched wrestling that night; I’ ll bet the acting was (13) .
It’ s not (14) I’ m snobbish--I enjoy TV (15) as much as the next slob. But the (16) of truly trashy trash has declined. I was one of the first writers in America to recognize the greatness of Robin Leach’ s" Lifestyles of the Rich and Famous." So, what do I watch I still turn to the networks, (17) I have learned to exploit and cheat them. For example, I like football, but seldom watch it (18) . In stead, I (19) it and later play it back an my VCR, fast - forwarding through all the commercials, the announcers’ babble, the half- time drivel and even the huddles. I also watched movies, but only on some cable channels, (20) the networks.

A:that B:why C:the way D:which

(In) his (latest) article Tom criticizes the way (which) the war (is being handled).

A:In B:latest C:which D:is being handled

B
A greenhouse is a building made of glass which is used for keeping plants warm when the outside temperature is how. In a similar way there are several gases in the atmosphere which trap(捕捉) the heat produced by the sun and prevent it from escaping. These gases are known as" greenhouse gases", and the way in which they trap heat in the atmosphere is called the "greenhouse effect". This is not simply air pollution. Most of the main greenhouse gases exist naturally in small amounts in our atmosphere. And without them earth would be 30 degrees colder and human life would not exist. In other words, the greenhouse effect is a natural course which is to some degree helpful to us.
The problem is that in the last century and a half, we have been putting too many of these gases into the earth’s atmosphere by burning large quantities of coal and oil and by cutting down forests. The rapid increase in greenhouse gases is making the world warmer. Tile world’s temperature has already gone up by half a degree this century, and the sea level has risen by 10 centimetres. If the amount of carbon dioxide(二氧化碳) in the atmosphere doubles, there will probably be a rise in the earth’s temperature of between 1 and 4 degrees. This may seem a small increase, but it would be enough to cause major changes in geography and agriculture. Large areas of the world would be flooded, and some areas would become dry and unable to produce crops. It is important, too, to consider that there may be a delay of about 30 years in the greenhouse effect. This means that we’re probably experiencing only now the effect of the gases put into the atmosphere before the 1960s. Since then, our use of these gases has greatly increased.

A:the way in which gases are used for keeping plants warm B:a natural course which is to some degree helpful to us C:the way" greenhouse gases trap heat on the earth D:the whole course in which greenhouse gases prevent heat

It is interesting to observe the way in (61) children so often react against their parents’ ideas, while at the same time (62) their parents’ characteristics. That is to say, the children grow up to (63) different views from their parents, yet to have (64) personalities. There is a (65) going on in the toy world at present over whether children should be (66) to have war toys. I do not believe in encouraging war toys, but I don’t see any (67) in forbidding them when I think of the (68) of my friend Henry.
Henry is the (69) of strict parents who were totally opposed to war. He was never allowed toy soldiers (70) a boy, never allowed guns.
Henry grew up and went into the army, becoming a first-class soldier and (71) all sorts of military honors in a rather fierce unit. He became the opposite in (72) way of what his parents might have expected (73) their son. And yet there is a gentleness about Henry which shows a (74) personality. There is a sympathetic element about the man which I can see (75) have come from his family. In (76) of doing things differently from our parents, a lot of the spirit gets passed on.
Parents in all conscience have to (77) their children what they believe to be right. Perhaps the (78) way to teach one’s child gentleness is (79) forbid toy guns, but to be gentle in one’s (80) everyday life.

A:spite B:that C:which D:way

It is interesting to observe the way in (61) children so often react against their parents’ ideas, while at the same time (62) their parents’ characteristics. That is to say, the children grow up to (63) different views from their parents, yet to have (64) personalities. There is a (65) going on in the toy world at present over whether children should be (66) to have war toys. I do not believe in encouraging war toys, but I don’t see any (67) in forbidding them when I think of the (68) of my friend Henry.
Henry is the (69) of strict parents who were totally opposed to war. He was never allowed toy soldiers (70) a boy, never allowed guns.
Henry grew up and went into the army, becoming a first-class soldier and (71) all sorts of military honors in a rather fierce unit. He became the opposite in (72) way of what his parents might have expected (73) their son. And yet there is a gentleness about Henry which shows a (74) personality. There is a sympathetic element about the man which I can see (75) have come from his family. In (76) of doing things differently from our parents, a lot of the spirit gets passed on.
Parents in all conscience have to (77) their children what they believe to be right. Perhaps the (78) way to teach one’s child gentleness is (79) forbid toy guns, but to be gentle in one’s (80) everyday life.

A:spite B:that C:which D:way

(In) his (latest) article Tom criticizes the way (which) the war (is being handled).

A:In B:latest C:which D:is being handled