单项选择题

Questions 29 and 30 are based on the following news. At the end of the news item, you will be given 10 seconds to answer the questions.
Now, listen to the news.
What can we learn about the impactor

A．It is a little more than 180 kg.
B．It is about 3 tons.
C．It travels at a speed of 37 thousand kilometers all hour.
D．It travels at a speed of 17 thousand kilometers an hour.
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单项选择题
What negative effects may the intermarriage most probably cause
A．A quick divorce.
B．Much suffering in children’s minds.
C．A big gap between parents and children.
D．Cultural shock.
单项选择题
Which of the following statements is true according to the passage
A．The longer the sleep is, the more productive the staff is.
B．Napping cannot be applied to safety-critical jobs.
C．The research was first designed for the astronauts.
D．If you sleep more hours awake you are more productive.
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