一国港口吞吐量的宏观总量，在一定程度上是该国综合实力的体现。
参考答案：对
While we were running on the playground, Jack suddenly stopped____ and lay on the ground,so we all stopped_____ what was wrong with him.
A．to run; to see
B．running; seeing
C．running; to see
D．running; see
Tom was playing football on the road. A car was coming, Jack called to Tom, "Look out!". Here "look out"
means ______. [ ]
A. 向外看
B. 当心
C. 向前看
D. 抬头看
