问题
选择题
To reduce air pollution, a large number of people in London go to work by bike or on foot, _____
do many of my friends in China.[ ]
A. as
B. which
C. while
D. where
答案
答案：A
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To reduce air pollution, a large number of people in London go to work by bike or on foot, _____
do many of my friends in China.[ ]
A. as
B. which
C. while
D. where
答案：A
在一个密闭容器内有X、Y、Z、Q四种物质，在一定条件下充分反应，测得反应前后各物质的质量见下表。该密闭容器中发生的反应属于
| 物质 | X | Y | Z | Q |
| 反应前的质量/g | 2 | 2 | 84 | 5 |
| 反应后的质量/g | 待测 | 24 | 0 | 14 |
A．分解反应 B．化合反应 C．置换反应 D．复分解反应