在煤气的组成中，我们一般用什么表示？（）
A.重量百分比
B.体积百分比
C.质量百分比
D.PPM
参考答案：B
— If your son keeps practising, he _____ to make a famous cross-country skier in our province.
— I'm thrilled with joy and very grateful to you, Mr. Li. [ ]
A. wants
B. hopes
C. promises
D. wishes
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