下列实验操作中正确的是

— I’m sorry, but I shouldn’t have been so rude to you.

— You _____ your temper but that’s OK.

A．have lost

B．had lost

C．did lose

D．were losing

China has recently ______ its waters controls near the Diaoyu Islands to prevent Chinese fishing boats from ______ in the East China Sea．

A．show up; attacking

B．taken up; having attacked

C．stepped up; being attacked

D．picked up; having been attacked

泡沫渣往往是由于（）和（）造成的。

脊髓灰质炎的瘫痪特点是（）

A.对称性迟缓性瘫痪，有感觉障碍

B.对称性迟缓性瘫痪，无感觉障碍

C.不对称性迟缓性瘫痪，有感觉障碍

D.不对称性迟缓性瘫痪，无感觉障碍

E.双下肢痉挛性瘫痪，无感觉障碍

短效口服避孕药的服用方法是什么？