单项选择题

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.
What’s the main topic of this passage

A．It’s about the tests of a new airliner before its flying.
B．It’s about how to protect a new airliner.
C．It’s about how to train a new pilot.
D．It’s about what the airliner engineers should do.

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单项选择题

What can we infer from the passage

A．Plants have more characteristics than animals.
B．Animals have more characteristics than plants.
C．Plants and animals are different in several ways.
D．Plants and animals are less powerful than human beings.

单项选择题

Which of the following is TRUE about plants

A．They have the power of locomotion.
B．They have a wider range of foods than animals.
C．They are very diverse in their external appearance.
D．They are less sensitive than animals.

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20. What’s the main topic of this passage 您的浏览器不支持 audio 元素。

Questions 17--20 are based on the following passage. You now have 20 seconds to read Questions 17--20.
What’s the main topic of this passage