单项选择题


Passage One
Questions 26 to 28 are based on the passage you have just heard.

A．Because men on the Earth are protected by the atmosphere.
B．Because radiation only have short-term effects on men on the Earth.
C．Because the Earth is quite far from the radiation areas.
D．Because the Van Allen Belts absorb all radiation.
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单项选择题
Nowadays sled dogs are still necessary when ______.
A．there are severe weather conditions
B．flying machines are full with passengers
C．snow machines use up power in the Arctic region
D．people need partners during the travel
单项选择题
We can learn from the second paragraph that ______.
A．Pepsi takes a larger share in the soft-drink market than Coke
B．both Pepsi and Coke’s colas lost their share last year
C．Coke’s share of the cola market has declined while Pepsi’s has increased
D．Coke brands have lost its popularity in the soft-drink market
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