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 does the passage tell us about American rivers

A．One sixth of them are seriously polluted.
B．One third of them are seriously polluted.
C．Half of them are seriously polluted.
D．Most of them are seriously polluted.

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单项选择题

The announcement of the ceasefire has been delayed because

A．Hamas has not agreed to stop attack against Israel.
B．Israeli troops have not withdrawn from parts of the Gaza Strip and Bethlehem.
C．the Islamic Jihad has not agreed to join the agreement.
D．there has been some disagreement over the wording of the ceasefire.

单项选择题

An attack by a swarm of the reddish-brown insects

A．is fatal.
B．won’t be serious.
C．can cause allergic reactions.
D．will be an extremely rare case.

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 does the passage tell us about American rivers 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 does the passage tell us about American rivers