自然因素造成的食品的放射性污染是指食物中放射性物质来源于地球上的()如土壤、空气、岩石、水域等。
A. 远红外
B. 电磁波
C. 放射线
D. 辐射热
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The text shows that in making a decision, an optimistic person______.
A. neglects taking all factors into consideration
B. ignores possible flaws in whatever he thinks
C. disregards unfavorable factors deliberately
D. is more likely to make unnecessary errors
It is implied that the Age Discrimination in Employment Act
A. fails to effectively protect Americans from discrimination
B. calls for arbitration of age-discrimination claims
C. flies in the face of the earlier judicial decisions
D. impedes antidiscrimination law tremendously
By citing the example of the response to his questions, the author shows that ______,
A. people usually prefer positive questions to negative ones
B. whether dogs have feelings is a desirable question to ask
C. whether dogs don"t have feelings is a silly question to ask
D. human behavior. can serve as a guide to study animal feelings
It can be inferred from the text that animal emotions ______ .
A. originate from natural evolution
B. remain uncertain until we are sure
C. develop faster in social encounters
D. are as rich and deep as human emotions
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