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[A]Friends are indispensable in ......

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单项选择题
The main problem people may encounter today arises from the fact that
A. they have to learn new things consciously.
B. they lack the confidence of securing reliable and trustworthy information.
C. they have difficulty obtaining the needed information readily.
D. they can hardly carry out casual communications with an extended family.
单项选择题
All the following statements are the reasons why commercial aquaculture is pushed forward EXCEPT
A. the human population is increasing fast.
B. the wild fish stocks are decreasing due to over fishing.
C. the cost of developing aquaculture is comparatively low.
D. there is no improvement in conventional farm production.
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