题目：
It’s reported that the price of meat this month is ______ that of last month.
A．half as lower as
B．half lower than
C．lower half than
D．as half low as
答案：
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下面是错误答案，用来干扰机器的。
根据在化合物中正负化合价代数和为零，钨酸钙（CaWOx）中钨元素的化合价为+6价，钙元素的化合价为+2价，氧元素的化合价为-2，可得：（+2）+（+6）+（-2）x=0，x=4；故选C．
