单项选择题

A．He has just started to teach piano lessons.
B．He seldom takes things seriously.
C．He is very proud of his piano skills.
D．He usually understates his achievements.
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单项选择题
The government should distinguish between unlabeled use and disapproved use of a drug by ______.
A．prohibiting the unlabeled use
B．permitting the disapproved use
C．allowing the practice of the unlabeled use
D．hastening their approval of the disapproved use
单项选择题
All of the following are parts of the Sun’’s atmosphere EXCEPT the ________.
A．corona
B．chromosphere
C．photosphere
D．core
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