The atmosphere ________ the earth．

The atmosphere ________ the earth．

A.surrounds

B.is surrounding

C.has surrounded

D.has been surrounding

答案及解析： A

解析：

这句句子的意思是“大气层包围地球。”客观真理一般用一般现在时表示，如：The sun rises in the east．Water boils at 100 degrees centigrade．