题目内容

Does the boss pay his workers __________?

A. by an hour
B. by hours
C. by the hour
D. by a hour

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The front wheel of the first bike is almost __________ of the back one.

A. five times size
B. five times the sizes
C. five times the size
D. five time size

We produced __________ cars this month as we did last month.

A. twice as many
B. as twice many
C. as many twice
D. twice many as

抛掷一颗骰子一次，记事件A表示：出现偶数点，事件B表示：出现3或6点，则事件A与事件B是相互独立事件

A. 对
B. 错

某元素基态原子，有量子数 n=4、l=0、m=0 的二个电子，有 n=3、l=2 的 10 个电子，该元素位于周期表的位置是（）。

A. 四周期，ⅡB族
B. 三周期，ⅡA族
C. 三周期，ⅡB族
D. 四周期，ⅡA族