单项选择题

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.
What is the concern of ordinary people about the "Greenhouse Effect"

A．Whether it can be detected and checked.
B．Whether it will lead to widespread food shortage.
C．Whether global warming will speed up in the future.
D．Whether it will affect their own lives.

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单项选择题

Why does the student say that it’s complicated and embarrassing

A．To confess that he lied to the professor.
B．To emphasize what he is about to say.
C．To prove that he is innocent.
D．To warn the professor not to ignore him.

单项选择题

Nowhere in nature is aluminum found free, owing to its always ______ with other elements, most commonly with oxygen.

A．being combined
B．having combined
C．to combine
D．combined

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. What is the concern of ordinary people about the "Greenhouse Effect" 您的浏览器不支持 audio 元素。

Questions 17 to 20 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage.
What is the concern of ordinary people about the "Greenhouse Effect"