食品污染对人体健康和安全会造成（）。
A.急性中毒
B.慢性中毒
C.致畸作用
D.致突变作用
E.致癌作用
参考答案：A, B, C, D, E
The old scientist took up walking as a regular form of exercise, which, of course, is of great to his heath.
A．benefit
B．favor
C．sense
D．relationship
下列哪几项是植物性气管、支气管异物可能的X线检查所见（）
A.肺不张
B.肺气肿
C.肺部炎性表现
D.可见异物阴影
E.无明显异常
