虎克第一次观察细胞时，因显微镜放大的倍数太低，未能发现细胞核。( )
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Customer：，are you the manager here？Manager：Yes，I am．What can I do for you？
A. I beg your pardon
B. Pardon me
C. Excuse me
D. Forgive me
The People‘s Republic of China was__________in 1949．
A. found
B. founded
C. built
D. put up
I wonderon sale．
A. how much cost these shoes
B. how much do these shoes cost
C. how much these shoes cost
D. how much are these shoes cost
We have already built two tunnelswe can get across the big river．
A. which
B. on which
C. by which
D. through which
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