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.
How many refugees came from Vietnam since the early 1970s
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A.About 35,000.
B.About 250,000.
C.About 350,000.
D.About 25,000.
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单项选择题
What forms of radiation are feared by astronauts
A.Radiation from the sun.
B.Radiation from the Van Allen Belts.
C.Radiation from the meteors.
D.Both A and B.
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单项选择题
What have the Sierra rebels and pro-government militiamen done under an agreement to end the recent fighting
A.They have killed thousands of civilians.
B.They have fought each other again.
C.They have begun handing over their weapons to U.N. peacekeepers.
D.They have found a diamond min
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