题目内容
（请给出正确答案）
Time needed for physical activity depends on______.
A．health
B．effort
C．money
D．kinds of activities
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B.where he needed
C.where he is mostly needed
D.where is he mostly needed
A.what
B.why
C.whom
D.which
A.错误
B.正确
A、As
B、For
C、With
D、Through
A. hearing, saying, to repair
B. to hear, say,to repair
C. hearing, say, repairing
D. to hear, saying, to be repaired
B.find
C.to finding
D.finding
Sometimes a researcher cannot get valid results because ______.
A．the information needed is too complex to be gathered
B．personal interviewing is the most accurate of all survey research techniques
C．personal interviewing is not as effective as other research techniques
D．both interviewer and interviewee may make mistakes during the interviewing
