下列物质的用途与其化学性质相关的是[ ]
A．用铝作导线
B．用汽油去除衣物上的油污
C．用天然气作燃料煮饭
D．用氦气填充探空气球
答案：C
There is still much room for improvement in our work, I see it.
A．because
B．since
C．which
D．as
1t was so lucky that I came across my old friend _____ I came to this
company. [ ]
A. the first time
B. every time
C. for the first time
D. at times
