问题
选择题
The price of the shorts is very ________. [ ]
A. dear
B. cheap
C. expensive
D. high
答案
答案：D
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The price of the shorts is very ________. [ ]
A. dear
B. cheap
C. expensive
D. high
答案：D
Si+2CO↑，其中氧化剂与还原剂的物质的量之比为( )