How is the world different today (in 1961)
A. We can destroy each other.
B. We can travel quickly.
C. We can get rid of hunger.
D. We can fend for ourselves.
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统计工作中常用的抽样方法是( )。
A. 随机抽样
B. 单纯随机抽样
C. 系统抽样
D. 整群抽样
The Smiths______ the Summer Palace three times.
A. have gone to
B. have been in
C. have been to
D. have gone into
成人大量血胸，出血量多( )
A. ＞300ml
B. ＞500ml
C. ＞1000ml
D. ＞1500ml
E. ＞2000ml
What guarantees the exchange of audio and video attachments
A. Higher-end applications.
B. Four megabytes' e-mail storage.
C. Sixty-two megabytes' e-mail storage.
D. 250 megabytes' e-mail storag
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