1.Only after the Earth Summit______that air pollution causes almost three million deaths every day.
A.I knew B.did I know C.do I know D.knew I
2.It has become a______in many parts of China to use credit cards.
A.approach B.custom C.aid D.trend
How to choose;translate and why? Thanks.
參考答案:1 B，，是到装句，所以排除D．
知道地球会议后，我才知道空气污染每天使大约300万人死亡
2 D,趋势
在中国的很多地方，用信用卡成为一个趋势
