单项选择题

He has just taken an examination () chemistry.

A. for
B. about
C. on
D. in

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单项选择题
All the () of the city went to the meeting last Saturday.

A. mathematic teachers
B. mathematics teacher
C. mathematics teachers
D. mathematic's teacher
单项选择题
The Yellow River is the second () river in China.

A. long
B. longer
C. longest
D. most long
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