单项选择题

Questions 16 to 20 are hsed on the following passage. At the end of the possage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
Which of the following statements is true

A．Early man didn’t know how to make use of trees.
B．Trees are not as useful as they were in the past.
C．Trees were more useful in the past than they are now.
D．Trees are always useful and important to human beings.

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单项选择题

How many people in South Africa are estimated to be affected with AIDS

A．Over one million.
B．Over two million.
C．Over three million.
D．Over five million.

单项选择题

What is the main topic of the talk

A．How the President proposes new laws.
B．How a bill is passed by lawmakers in Congress and the President.
C．How the President can reject a proposed law.
D．How lawmakers can force the President to sign a bill.

Questions 16 to 20 are hsed on the following passage. At the end of the possage, you will be given 15 seconds to answer the questions. Now listen to the passage. Which of the following statements is true 您的浏览器不支持 audio 元素。

Questions 16 to 20 are hsed on the following passage. At the end of the possage, you will be given 15 seconds to answer the questions.
Now listen to the passage.
Which of the following statements is true