题目内容

Silk, printing, paper, the compass and powder originated in China, and ______ introduction in the west had far reaching effects.

A. these
B. their
C. those
D. its

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Put things back（）you found them.

A. where
B. that
C. which
D. since

可用于家庭保健的一次性吸血、敷药使用的

A. 医用橡皮膏
B. 医用纱布
C. 一次性使用输液器
D. 医用绷带
E. 创可贴

I'd like to arrive 20 minutes early ______ I can have time for a cup of te

A. a.A. as soon asB. as a resultC. in caseD. so that

—When has the country been open to international trade —1960, I suppose.

A. Since
B. In
C. From
D. After