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碘钨灯泡外壳是用石英(SiO2)制作的。试用热力学数据论证：“用玻璃取代石英的设想是不能实现的”。灯泡内局部温度可达623 K，玻璃主要成分之一是Na2O，它能和碘蒸气起反应生成NaI。
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A.
are providing proper conditions for good writing
B.
should not stress writing speed on a test
C.
should give essay tests rather than multiple-choice tests
D.
teach good writing primarily through reading
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A.
still
B.
anyway
C.
otherwise
D.
rather
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