更多"Animals have different ways of prot"的相关试题:
[单项选择]Animals have different ways of protecting themselves against wintertime weather. Some animals grow heavy coats of fur or feathers, while others dig into the ground to find a warm wintertime home.
Some animals spend the winter in a deep sleep because by going to sleep they avoid the time of the year when food is scarce and the temperatures are low. Their sleep is known as hibernation.
There is much about hibernation that puzzles scientists. For example, they are wondering how hibernation came into being. Some scientists have explored the possibility that animals release a chemical that starts them hibernating.
One thing that scientists are certain about is that animals hibernate only when it is cold. Hibernation is a seasonal practice.
Some animals that fall into a wintertime sleep are not true hibernators because they spend only a part of the cold season asleep. Bears, for example, can easily be awakened from their winter nap. They are not true hibernators.
Som
A. takes place only during a particular season
B. occurs only during the night
C. is a daily practice
D. only happens when a species becomes over-populated
[单项选择]Most animals have little connection with animals of a different kind, unless they hunt them for food. Sometimes, however, two kinds of animals come together in a partnership(伙伴关系) which does good to both of them. You may have noticed some birds sitting on the backs of sheep. This is not because they want a ride, but because they find easy food in parasites(寄生虫) on sheep. The sheep allow the birds to do so because they remove the cause of discomfort. So although they can manage without each other, they do better together.
Sometimes an animal has a plant partner. The relationship develops until the two partners cannot manage without each other. This is so in the corals (珊瑚) of the sea. In their skins they have tiny plants which act as "dustman", taking some of the waste products from the coral and giving in return oxygen which the animal needs to breathe. If the plants are killed, or are even prevented from light so that they cannot live normally, the corals will die.
Some birds
A. they can eat its parasites
B. they depend on the sheep for existence
C. they enjoy travelling with the sheep
D. they find the position most comfortable
[单项选择]
C
Most animals have little connection
with animals of a different kind, unless they hunt them for food. Sometimes,
however, two kinds of animals come together in a partnership(伙伴关系) which does
good to both of them. You may have noticed some birds sitting on the backs of
sheep. This is not because they want a ride, but because they find easy food in
parasites(寄生虫) on sheep. The sheep allow the birds to do so because they remove
the cause of discomfort. So although they can manage without each other, they do
better together. Sometimes an animal has a plant partner. The
relationship develops until the two partners cannot manage without each other.
This is so in the corals (珊瑚) of the sea. In their skins they have tiny plants
which act as "dustman", taking some of the waste products from the coral and
giving in return oxygen which the animal ne A. they can eat its parasites B. they depend on the sheep for existence C. they enjoy travelling with the sheep D. they find the position most comfortable
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