3. Why did Tim raise his head regularly?
A. To check his distance from the boys.
B. To consider turning back or not.
C. To take in enough fresh air.
D. To ask the boys to take down the umbrella.
4. How did the two boys finally reach the pier?
A. They were carried to the pier by Tim on his back.
B. They swam to the pier all by themselves.
C. They were washed to the pier by the waves.
D. They were dragged to the pier by Tim.
参考答案1-4 CBAD
