单项选择题

We should ______ when we want to glimpse inside the sun.

A．answer questions about its temperature
B．translate the sounds into images
C．know how gases inside ebb and flow
D．measure the pitch
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单项选择题
Jackie complained that nobody was doing anything to ______.
A．prevent people from having trouble with teeth
B．stop teeth from falling out
C．put men on the moon
D．transplant hearts and other organs
单项选择题
Which one was not mentioned in the conclusion document issued by the summit
A. the EU would develop a strategic partnership with ChinaB the EU had decided to lift the arms ban later this yearC the EU would try to resolve the trade dispute with China quicklyD the EU promised to intensify dialogue in all areas
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