题目内容
Insects have many different living and eating habits. Some live in hot climates; others ________ cool temperatures. Some eat plants; others eat other insects or dead animals.A. fix B. intend C. live D. prefer
提示：
| some与others体现出对称语境，应填prefer。
|
As they migrate（迁移) , butterflies and moths choose the winds they want to fly with, and they change their body positions if they start floating in the wrong direction. This new finding suggests that insects may employ some of the same methods that birds use for traveling long distances. Scientists have long thought that insects were simply at the mercy of the wind.
Fascinating as their skills of flight are, migrating behavior has been difficult to study in insects because many long distant trips happen thousands of feet above ground. Only recently have scientists developed technologies that can detect such little creatures at such great heights.
To their surprise, though, the insects weren't passive travelers on the winds. In autumn, for example, most light winds blew from the east, but the insects somehow sought out ones that carried them south and they positioned themselves to navigate directly to their wintering homes.
Even in the spring, when most winds flowed northward, the insects didn't always go with the flow. If breezes weren't blowing in the exact direction they wanted to go, the insects changed their body positions to compensate. Many migrating birds do the same thing.
The study also found, butterflies and moths actively flew within the air streams that pushed them along. By adding flight speeds to wind speeds, the scientists calculated that butterflies and moths can travel as fast as 100 kilometers an hour. The findings may have real-world applications. With climate warming, migrating insects are growing in number. Knowing how and when these pests move could help when farmers decide when to spray their crops.
【小题1】 What's the main idea of the text?
| A．Windsurfing insects have real direction. |
| B．Wind helps insects greatly in migrating. |
| C．Insects migrate with the seasons. |
| D．Scientists have trouble in observing insects. |
| A．insects were just blown about by the wind |
| B．insects chose the winds they wanted to ride |
| C．insects always waited for their favourable winds |
| D．insects positioned themselves in the winds |
| A．the little creatures can fly very fast |
| B．their flight is long and high above ground |
| C．the wind's direction is hard to foresee |
| D．they have no regular migrating courses |
| A．insects never position themselves when flying low |
| B．insects travel more easily in autumn |
| C．insects fly in the way birds do |
| D．insects rest a lot when the wind pushes them along |
About ten men in every hundred suffer from color blindness in some way. Women are luckier; only about one in two hundred is affected in this matter. Perhaps, after all, it is safer to be driven by a woman!
There are different forms of color blindness. In some cases a man may not be able to see deep red. He may think that red, orange and yellow are all shadows of green. Sometimes a person cannot tell the difference between blue and green. In rare cases an unlucky man may see everything in shades of green － a strange world indeed.
Color blindness in human beings is a strange thing to explain. In a single eye there are millions of very small things called “cones”. These help us to see in a bright light and to tell difference between colors. There are also millions of “rods”, but these are used for seeing when it is near dark. They show us shape but no color.
Some insects have favorite colors. Mosquitoes prefer blue to yellow. A red light will not attract insects, but a blue lamp will. In a similar way human beings also have favorite colors. Yet we are lucky. With the aid of the cones in our eyes we can see many beautiful colors by day, and with the aid of the rods we can see shapes at night. One day we may even learn more about the invisible colors around us.
1.The passage is mainly about _____________.
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A．color and its surprising effects. |
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B．women being luckier than men |
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C．danger caused by color blindness |
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D．color blindness |
2.According to the passage, with the help of the “cones”, we can_______________.
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A．tell different shapes |
B．see in a weak light |
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C．kill mosquitoes |
D．tell orange from yellow |
3.Why do some people say it is safer to be driven by women?
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A．Women are more careful. |
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B．There are fewer color-blind women |
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C．Women are fonder of driving than men. |
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D．Women are weaker but quicker in thinking. |
4.Which of the statements about the color- blind is true?
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A．Not all of them have the same problem in recognizing color. |
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B．None of them can see deep red. |
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C．None of them can tell the difference between blue and green. |
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D．All of them see everything in shades of green. |
5.We can attract and kill mosquitoes by using a _____________.
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A．red light |
B．yellow light |
|
C．blue light |
D．green light |