—What's this in English?
—______ a pencil case. [ ]
A. This's
B. This is
C. Its
D. It's
答案:D
某城镇对百白破制剂的效果进行评价,所得结果统计如下(地区人口稳定):
根据上表数据算得其效果指数为()。
A.100
B.100%
C.99%
D.110
E.90%
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