下列各现象中，需要对外放热的是[ ]
A．洒在地上的水逐渐变干
B．.灯丝使用久了会变细
C．天气寒冷，下起大雪
D．春天，河面上的冰化成水
答案：C
卫星接收天线高频头坏了，换用普通的高频头，是否也能收到信号？
35. The clever boy made a hole in the wall, ____ he could see ____ was going on inside the house.
A．which;what
B．throughwhich;what
C．throughthat;what
D．what;that
