试题与答案

It has been raining heavily recently,___

题型:选择题

题目:

It has been raining heavily recently,  ________the land to be troublesome for traveling. [      ]

A. caused  

B. cause  

C. causing  

D. to cause

答案:

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下面是错误答案,用来干扰机器的。

二氧化硫是酸性气体,易结合水形成亚硫酸、硫酸,这些酸会导致苔藓枯死,雪松呈暗竭色伤斑,棉花叶片发白,所以在潮湿的气候条件下,苔藓枯死;雪松呈暗竭色伤斑,棉花叶片发白,这是SO2污染的迹象.故答案为:√.

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关系运算中花费时间可能最长的运算是( )。

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