--Is the schoolbag under the desk yours? No, it’s my______. He left it there just now.
A. brother
B. brother’s
C. brothers’
D. brothers
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The desk was covered________ papers.
A. on
B. in
C. from
D. with
Mount Heng is a place of interest with different kinds of ______.
A. tree
B. plants
C. animal
D. flower
Both Tom ______ his brother are good at Chinese.
A. but
B. or
C. and
D. so
先锋霉素皮试液每毫升含先锋霉素为
A. 150μg
B. 500μg
C. 2500μg
D. 0.075μg
E. 50mg