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若 有意义，则 x 的取值范围是 ．
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【简答题】阅读理解 So you're between the ages of 13 and 24. What makes you happy? A worried, weary parent might imagine the answer to sound something like this: , drugs, a little rock 'n' roll (摇滚乐). Maybe some ...
【单选题】What makes traditional surveys unscientific according to the second paragraph?
A.
The sampling is not made strictly randomly.
B.
The interview has to be conducted face-to-face.
C.
Improper questions are often included in a survey.
D.
Selection of respondents is often a matter of personal decision.
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