It's _____, so they are walking.[ ]
A. rainy
B. windy
C. sunny
D. cloudy
答案：C
The train for the city at ten, so you have enough time to make preparations.
A．leaves
B．is leaving
C．is to leave
D．is going to leave
为了抑制锌的蒸发，焊接黄铜时，可选用含硅量高的黄铜或（）焊丝。
A、铝青铜
B、镍铝青铜
C、锡青铜
D、硅青铜
