—Was it in April, 1970         China succeeded              sending its first satellite into space?

—Yes, that’s right.

A．when; in

B．that; on

C．which; on

D．that; in

专业纤维检验机构在受理检验异性纤维或色纤维时，要对未开包棉花随机抽取（）%棉包，逐包开包挑拣异性纤维及色纤维。

A、1

B、3

C、5

D、10