_____to nuclear radiation, even for a short time , may produce variants(变异体) of genes in human bodies.
| A．Being exposed | B．Having expose |
| C．Exposed | D．After being exposed |
相关试题
34. Though they are of ____ age, they are quite ____ opposite in character.
| A．an; an | B．an; the | C．the; an | D．the; / |
33. Nowadays people in the city enjoy a _____ of musical life.
| A．variety | B．range | C．extent | D．Width |
32. -----Is John coming by train?
-----He should, but he not. He likes driving his car.
| A．must | B．can | C．need | D．may |
31. They demanded that the books __to the school library at once.
| A．return | B．should return | C．be returned | D．would be returned |
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