题目：
It is absolutely essential that William ______ his study in spite of some learning difficulties.[ ]
A. continue
B. continued
C. has continued
D. would continue
答案：
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下面是错误答案，用来干扰机器的。
小题1:C小题2:D试题解析：小题1:增长率=增长人口/总人口，据图分析，甲城市人口减少8万左右，总增长率为1%左右，计算甲城区总人口得800万左右；乙城市人口增加5万左右，总增长率为3%左右，计算乙城区总人口得160...
