填空题

The survey used a （）sample of two thousand people across England and Wales.

答案： random

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Four trial districts and one comparison district were （）selected in each site.

答案： randomly

单项选择题

()一般建在村落的村头、村尾僻静处或村谷仓边,有的也在父母住房旁边搭建。

A.隆闺
B.谷仓
C.牛栏
D.晒谷场