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18．In this workshop, the output of July was three times ____ of January.
A．that
B．this
C．one
D．it
答案及解析：
选A (that)。该题考查语法：英文倍数的表达方法之一：the+计量名词+of+A+be+倍数+that+of+B。该句意为：这间工厂七月份的产量是一月份的三倍。
此外，英文中，关于倍数的表达方式还有很多种，如：
1．A+be+倍数+as+计量形容词原级+as+B.
This tree is three times as tall as that one.
这棵树是那棵树的三倍高。
2．A+be+倍数+计量形容词比较级+than+B
The Yangtze River is almost twice longer than the Pearl River.
长江差不多比珠江长两倍。
3．A+be+倍数+the+计量名词+of+B
The newly broadened square is four times the size of the previous one.
新扩建的广场是未扩建时的四倍大。
4．The+计量名词+of+A+be+倍数+that+of+B
The size of the newly broadened square is four times that of the previous one.
新扩建的广场为以前的四倍大。
5．其它
I'm twice/double his age.
我的年龄是他的两倍。
I've paid five times the usual price for the stamp.
我出了5倍于往常的价格买这枚邮票。
