单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
What is the speaker mainly talking about

A．How animals survive harsh conditions in the wild.
B．How animals alter colors to match their surroundings.
C．How animals protect themselves against predators.
D．How animals learn to disguise themselves effectively.

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单项选择题

The following countries are the rising stars in the aerospace industry EXCEPT

A．Russia.
B．India.
C．France.
D．Chin

单项选择题

There are so many international restaurants in the United States because

A．many foreign tourists visit the United States every year.
B．Americans enjoy eating out with their friends.
C．the United States is a country of immigrants.
D．Americans prefer foreign foods to their own foo

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What is the speaker mainly talking about 您的浏览器不支持 audio 元素。

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be given 15 seconds to answer the questions.
Now, listen to the passage.
What is the speaker mainly talking about