Ⅰ. 听力(10分)
(Ⅰ)录音中有五个句子, 听一遍后, 选择最佳答语。(5分)
1. A. By turning on the light.
B. By turning on the radio.
C. By turning off the light in time.
2. A. To ride a bike.
B. To throw rubbish away.
C. To stay alone.
3. A. In 1972. B. In Beijing.
C. On the earth.
