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单项填空
Harry visited the bookstore every week. He
became such a customer that the
bookseller gave him some books as presents. （2009·12·浙江桐庐检测）
common B.
normal C. usual D. average
解析：选C。由“Harry visited the bookstore every week”可知，他是常客，含有“习惯，惯例”之意，故选C。
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2. signal
n. 信号；手势；声音；暗号
v. 发信号；用信号传达；用信号与……通讯
A red light is
usually a signal for/of danger.
红灯通常是危险的信号。
He signaled (to)
the waiter to bring the menu.
他示意服务员把菜单拿过来。
常用结构：
signal to sb./sth.
for sth.
用信号传达（某信息）；用信号与（某人）通讯
signal with ...用……发信号
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高手过招
翻译句子
①铁路的红信号灯亮了，所以火车停下了。
②他用红旗传达信号。
答案：①The railway signal was on red, so the train
stopped.
②He was signalling with a red flag.
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3. sum
n. 金额; 款项; 总数; 算术题
常用结构：
in sum 简言之; 总而言之
sum up/sum sth.
Up 总结；概括
He was fined the
sum of 200$. 他被处以200美元的罚金。
The sum of 5 and 3
is 8. 5加3的和是8。
To sum up, there
are three main ways of solving the problem.
概括起来说，这个问题主要有三种解决办法。
答案：In sum, the plan failed.
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