填空题

She brought up the water, ____________(在每一个楼梯拐弯处停下来歇口气).

【参考答案】

stopping at each landing to catch her breath
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单项选择题
Pure science, leading to the construction of a microscope ______.
A．is not always as pure as we suppose
B．necessarily results from applied science and the discovery of a cell
C．may lead to antiscientific, "impure’ results
D．necessarily precedes applied science, leading to the discovery of the cell
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