What is the writer's attitude towards recycling？
A. Positive.
B. Negative.
Critical.
Doubtful
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A big problem of solid waste disposal is that____。
A. solid waste are poisonous
B. it is difficult to find places to dispose of solid wastes
C. the disposal process is too backward
D. we don't have enough manpower to dispose of solid wastes.
Papousek noticed in his studies that a baby___．
A. would make learned responses when it saw the milk
B. would carry out learned movements when it had enough to drink
C. would continue the simple movements when it had enough to drink
D. would turn its head to right or left when it had enough to drink
The result of the enormous differences in Chinese dialects, as far as the author
Why did saccharin have a bad name in the late 1970s and early 1980s？
A. Because saccharin contains no calories.
Because some people developed cancer after taking saccharin.
C. Because saccharin was reported to have caused cancer in lab animals.
D. Because saccharin tastes bad.
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