选择括号中的动词填空。

1. Either the physicians in this hospital or the chief administrator _____ going to have to make a decision.

    (is, are)

2. _____ my mother or my sisters going to get this chance abroad? (Is, Are)

3. Some of the votes _____ to have been miscounted. (seems, seem)

4. The tornadoes that tear through this county every spring _____ more than just a nuisance. (is, are)

5. Everyone selected to serve on this jury _____ to be willing to give up a lot of time. (has, have)

两个4Ω的电阻并联起来，它的总电阻是（）。

A.4Ω；

B.8Ω；

C.16Ω；

D.2Ω。