题目内容
在测量电压时，电压表应（ ）在负载两端。
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在测量电流时，电流表应（ ）在负载两端。
North American students of European background paid more attention to the object in the foreground of a scene, while students from China spent more time studying the background and taking _____ the whole scene.
The researchers tracked the eye movements of the students to determine where they were looking in a picture and how long they focused _____ a particular area.
And that, he said, goes back _____ the ecology and economy of times thousands of years ago.
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