题目内容

Scientists have many theories about how the universe ____ into being.

A. came
B. was coming
C. had come
D. would come

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-Bob has gone to Califonia.-Oh, can you tell me when he____?

A. has left
B. left
C. is leaving
D. would leave

The computer is different from the one I ____in my last job.

A. use
B. have used
C. used
D. had used

What did you see ____?

A. now
B. every day
C. these days
D. just now

设计一块中值电阻为1500Ω的欧姆表,现有4块量程1mA的电流表,选哪块较好?

A. 内阻400Ω；
B. 内阻500Ω；
C. 内阻100Ω；
D. 内阻600Ω；