单项选择题


Questions 11 to 18 are based on the conversation you have just heard.

A．She decided to buy a gold necklace.
B．She decided to buy a pair of gold earrings.
C．She decided to buy a pair of gold earrings and necklace.
D．She decides to buy a pair of silver earrings.
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单项选择题
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.
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.
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
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