You shouldn’t __________________ us.
A. stay away from
B. stop from
C. stay off
D. stay
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______________ your help, we finished the work in time.
A. Thanks to
B. Thank you
C. Thanks
D. greet
_______________ 20, we don’t care what the world is thinking about us.
A.At the age of
B. in the age
C. on the age of
D. the age of
She had _______________ a full-time job as an English teacher.
A. applied for
B. asked for
C. required for
D. required
在pH 10的谷氨酸溶液中，下列哪一种结构占优势
A. 羧基，氨基都不解离
B. 羧基，氨基都解离
C. 只有α-羧基解离
D. α-羧基和γ-羧基都解离
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