What is the news item mainly about？
A. Smooth landing of the rover on Mars.
B. The stunning instruments on the rover.
C. New findings about the planet Mars.
D. Scientists" hard work on the project.
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How does the fire affect the local airport？
A. The thick smoke of the fire affects the vision.
B. The airport is forced to close temporarily.
C. The helicopters are refueled at the airport.
D. Airlines have to decide whether to land or not.
用乙醇加热浸提药材时可以用
A. 浸渍法
B. 煎煮法
C. 渗漉法
D. 回流法
E. 以上均不是
According to the new Frontline Health Workers Coalition, training health care workers can
A. improve the image of non-governmental organizations.
B. promote the progress of health treats all over the world.
C. help U.S. medical manufacturers earn much profit.
D. satisfy the donors" need to offer their help to others.
根据《铁路旅客运输办理细则》，对违反国家法律、法规，在站内、列车内寻衅滋事、扰乱公共秩序的人，站、车均可拒绝其上车或责令其下车，对未使用至到站的票价()。
A. 退还票价差额
B. 不予退还
C. 退还票价差额，核收退票费
D. 全部退还
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