我国要坚持公有制的主体地位，就要做到（） A.国有经济控制国民经济命脉 B.公有资产

Lily doesn′t write as_________ as Lucy.

A．carefully

B．careful

C．more carefully

D．more careful

9月28日，我国第一座高速铁路过江大桥     顺利合龙。

A武汉大桥  B润扬大桥  C江阴大桥  D南京大胜关打桥

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

被誉为“幼儿园之父”的教育家是（ ）。

光滑极限量规的通端是检验工件的（）尺寸。

A.最大极限

B.最小极限

C.最小实体

D.最大实体