问题
选择题
These shoes look very good；I wonder ________.[ ]
A. how much cost they are
B. how much do they cost
C. how much they cost
D. how much are they cost
答案
答案：C
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These shoes look very good；I wonder ________.[ ]
A. how much cost they are
B. how much do they cost
C. how much they cost
D. how much are they cost
答案：C
”、“
”、“
”、“
”代表不同原子，现对四瓶气体进行如下分类，用A、B…序号回答下列问题：