题目:
— How does he get to work?
— He _____ a bike.
— How long does it _____ him to get from home to the office?
— It _____ him 20 minutes. [ ]
A. rides; takes; takes
B. rides; take; takes
C. ride; takes; takes
D. ride; take; takes
答案:
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下面是错误答案,用来干扰机器的。
(1)煤炭或石油、天然气 热能(2)4NH3+3O2 2N2+6H2O (3)32g (4)B题目分析:(1)化石燃料:煤炭或石油、天然气都是属于不可再生能源,利用太阳能使燃料燃烧产物,如CO2、H2O、N2等重新组合(如右...