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2016-02-01

When did dinosaurs become extinct?

A．300 million years ago.

B．250 million years ago.

C．60 million years ago.

D．65 million years ago.

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D

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1 What can be inferred from Paragraph 3 concerning dinosaurs?

A．They were killed off by an asteroid.

B．They died of drastic climate change.

C．They were wiped offby a volcanic eruption.

D．The cause of their extinction has remained a controversial issue.

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2 What is the main thesis of the article?

A．Volcanic eruptions are not always deadly.

B．Older volcanic eruptions were more destructive.

C．Carbon dioxide emissions often give rise to global warming.

D．It is not easy to calculate the killing power of a volcani eruption.

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3 请根据短文内容，回答题。

Spacing in Animals Flight Distance

Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees. "Flight distance" is the terms used for this interspecies spacing. As a general rule, there is a positive relationship between the size of an animal and its flight distance- the larger the animal, the greater the distance it must keep between itself and the enemy. An antelope will flee when the enemy is as much as five hundred yards away. The wall lizard's flight distance, on the other hand is about six feet. Flight is the basic means of survival for mobile creatures.
Critical Distance Critical distance apparently is present wherever and whenever there is a flight reaction.
"Critical distance" includes the narrow zone separating flight distance from attack distance. A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome. If the man continues the approach, he soon penetrates the lion's critical distance, at which point the cornered lion reverses direction and begins slowly to stalk the man.
Social Distance Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies. Social distance is not simply the distance at which an animal will lose contact with his group -- that is, the distance at which it can no longer see, hear, or smell the group- it is rather a psychological distance, one at which the animal apparently begins to feel anxious when he exceeds its limits. We can think of it as a hidden band that contains the group.
Social distance varies from species to species. It is quite short--apparently only a few yards--among some animals, and quite long among others.
Social distance is not always rigidly fixed but is determined in part by the situation. When the young of apes and humans are mobile but not yet under control of the mother's voice, social distance may be the length of her reach. This is readily observed among the baboons in a zoo.
When the baby approaches a certain point, the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger, social distance shrinks. To show this in man, one has only to watch a family with a number of small children holding hands as they cross a busy street.
Which of the following is the most appropriate definition of Flight Distance?

A．Distance between animals of the same species before fleeing.

B．Distance between large and small animals before fleeing.

C．Distance between an animal and its enemy before fleeing.

D．Distance between certain animal species before fleeing.

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