题干
—How much did the guy _____ you to fix your 3G mobile phone?
— Idon't remember, but it was quite a lot．
— Idon't remember, but it was quite a lot．
A：cost
B：spend
C：charge
D：take
答案(点此获取答案解析）
C
2H2↑+O2↑．制得的氢气可用于燃料电池．试回答下列问题：