There is no point at all ______ to do something you hate or which you find boring because you will never stick to it.
A. starting
B. in starting
C. on start
D. start
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Lily’s mobile phone was left in a taxi accidentally, never ______ again.
A. to find
B. to be found
C. finding
D. being found
As there was not much chance to find good jobs in their hometown, many young men now tried to _____ their fortune in cities.
A. find
B. find out
C. seek
D. look at
由组距数列计算算术平均数时，用组中值代表组内变量的一般水平，有一个假定条件，即（ ）
A. 各组变量值相等
B. 各组次数相等
C. 各组是封闭组
D. 各组变量值在本组内呈现均匀分布
在加权算术平均数的计算中，权数对平均数的影响取决于（ ）
A. 各组变量值的大小
B. 次数绝对值的大小
C. 各组次数所占比重的大小
D. 变量值整体水平的高低
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