单项选择题

How many refugees came from Vietnam since the early 1970s

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 is the distance between the Earth and the two areas of radiation
A．Between 12 and 21 miles
B．1,000 miles
C．150 miles
D．1,500 miles
单项选择题
Why can't people on earth be harmed by radiation
A．Because men on the Earth are protected by the atmosphere.
B．Because radiation only has short-term effects on men on the Earth.
C．Because there is a great distance between the Earth and the radiation areas.
D．Because the Van Allen Belts absorb all radiation.
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