Caffeine withdrawal symptoms
A. can become an ongoing problem
B. may last as long as a week
C. are weight loss and mental disorder
D. are usually short-lived
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2010年进出口总额增速比2009年高:
A. 20.8个百分点
B. 21.4个百分点
C. 31.5个百分点
D. 48.6个百分点
从取水结构来看,与2008年相比,201 1年取水量下降的有几类?
A. 1
B. 2
C. 3
D. 4
出口增速最大年份的进出口总额约是进口增速最大年份的多少倍?
A. 1.4
B. 1.9
C. 2.6
D. 4.8