单项选择题

SECTION C

Question 6 is based on the following news. At the end of the news item, you will be given 10 seconds to answer the question.
Question 10 is based on the following news. At the end of the news item, you will be given 10 seconds to answer the question. Now listen to the news. How do the fireflies control the blinking

A．By their nerve cells.
B．They blink automatically.
C．By seeing the mates.
D．By the gas nitric oxide.

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单项选择题

According to the passage, which of the following statements about Vietnam veterans is NOT right

A．They may suffer from post-traumatic stress disorder when returned from wars.
B．They received only hostility and indifference when they returned from the wars.
C．Some of them have to struggle for the military benefits they deserve.
D．They formed more than one organization to help each other and work for the rights of veterans.

单项选择题

Crippen was absent from the DNB ______.

A．because he escaped to the U.S.
B．because death sentence had been abolished
C．for reasons not clarified
D．because of the editors’ mistake

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