当进行重力加油时，可加到油箱容量的（） A.100％ B.90％ C.80％ D.5

______ Lily and Lucy want to download music? [ ]

A. Do

B. Does

C. Are

D. Is

容易并发细菌性心内膜炎的败血症为()

A．肠球菌败血症

B．革兰阴性杆菌败血症

C．金葡菌败血症

D．厌氧菌败血症

E．表皮葡萄球菌

If a U.S. investor is forecasting that the yield spread between U.S. Treasury bonds and U. S. corporate bonds is going to widen, then which of the following is most likely to be TRUE（）

A. The economy is going to contract.

B. The economy is going to expand.

C. The U.S. dollar will weaken.

A．变化B．比赛C．北方D．菜单E．才F．办公室

A：现在已经四点半了，______几点开始
B：五点开始。

二极管的作用有（）。

A.放大

B.开关

C.单向导电