HE staining
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1、If he was fitter, he（）live longer.
If he was fitter, he（）live longer.A–（不填）BwillCwouldDca
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2、（）he was late, he was not criticized b
（）he was late, he was not criticized by the teacher.AEven thoughBEven ifCAs ifDAs though
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3、After that he knew he could any emerge
After that he knew he could any emergency by doing what be could to the best of his ability.Aget away withBget on withCget throughDget across
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4、He is not aware（）what he has done.
He is not aware（）what he has done.AforBtoCaboutDof
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负染色（negative staining）
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6、（）he was tired he went on working.
（）he was tired he went on working.AEvenBYetCAlthoughDIn spite