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【单选题】
第二恒磨牙最适宜窝沟封闭年龄是()A.
6~7岁来源:考试大
B.
7~8岁
C.
8~9岁
D.
10~11岁
E.
11~13岁
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举一反三
【单选题】I'm impressed with his persistence. When he had a problem to solve, he________work at it until he found an answer. [ ]
A.
would
B.
might
C.
must
D.
should
【简答题】Although he has sought to find a peaceful solution, he is facing strong mil______ pressure to use force.
【简答题】醋酸和醋酸钠混合溶液具有抗酸和抗碱能力,但是不具有缓冲作用。____
【单选题】He played a trick ____ Jessy and he had to apologize _____ treating her ____ a nice dinner.
A.
on; for; to
B.
in; by; to
C.
on; by; to
D.
on; by; with
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