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简述药品包装的重要作用？

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简述玻璃药包材的特点？

Section CChoose the best answer to complete each sentence.1. He ________ swim before. Now he can.

A. can
B. could
C. couldn’t

2. Lucy is a good girl, and she always behaves ________.

A. totally
B. politely
C. lonely

3. ________ you wait for me a moment?

Are
B. Can
C. Do