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问题 选择题

Lincoln had very little free time ______ he could spend studying then.

A．when

B．in which

C．at which

D．which

答案

答案：D

单项选择题

Quadrilateral RSTU shown above is a site plan for a parking lot in which side RU is parallel to side ST and RU is longer than ST. What is the area of the parking lot ？（）

(1)RU=80 meters

(2)TU=meters

A．条件(1)充分，但条件(2)不充分．

B．条件(2)充分，但条件(1)不充分．

C．条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．

D．条件(1)充分，条件(2)也充分．

E．条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．
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填空题

碱性水的特征是碱度大于硬度，在碱性水中，没有（）存在。
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