集装箱基本运价只()在等级公路上运输的千米运价。
A．集装箱空调
B．集装箱重箱
C．标准集装箱拼箱
D．标准集装箱重箱
参考答案：D
At a beach or a swimming pool a lifeguard is a person who is responsible for __________ other swimmers and protecting them from accidents.
A．turning to
B．watching over
C．watching out
D．digging out
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