单项选择题

Radio signals will take（）to reach the next star.

A．25 years
B．50 years
C．hundreds of years
D．a few years

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单项选择题
The drought in Europe has brought about all the following problems except （）

A．below-normal rainfall
B．difficult navigation
C．a sharp drop in oyster harvest
D．bone-dry hills
单项选择题
The word commercial in Para. 2 means（）

A．advertisement
B．business
C．notice
D．positive
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