题目内容

常用的抽样方法有(4个字)、(4个字)和(4个字)。

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在抽样调查时,抽样误差越小,用样本估计总体的可靠性就越____(1个字)。

6. There were _______ for Saturday’s movie.

A. not available tickets
B. no available tickets
C. no tickets available
D. tickets no available

7. It’s important for a company to keep _______ withchanges in the market.

A. pace
B. walk
C. run
D. foot

8. Tourists may be defined _______ persons who travel away from their home for a period not exceeding one year.

A. for
B. as
C. to
D. by