单项选择题

A．He can’t find his new apartment.
B．He had a bigger apartment before.
C．He finds the new apartment too big’ for him.
D．He’s looking for an apartment.
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单项选择题
A．She is writing a competitive paper for a scholarship.B．She is doing a paper.C．She missed the lecture.D．She is planning to attend the scholarship award ceremony.
A．She is writing a competitive paper for a scholarship.
B．She is doing a paper.
C．She missed the lecture.
D．She is planning to attend the scholarship award ceremony.
单项选择题
Why was Townes' early work with stimulated emission done with microwaves
A．He was not concerned with light amplification.
B．It was easier to work with longer wavelengths.
C．His partner Schawlow had already begun to work on laser.
D．The laser had already been developed.
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