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问题
单项选择题
牙周袋探诊时使用的力量为
A．10~20g
B．20~25g
C．25~30g
D．30~35g
E．35~40g
答案
参考答案：
B
选择题
The _____ look on his face suggested that he hadn't expected _____ would happen.
A. surprised; what
B. surprising; what
C. surprised; that
D. surprising; that
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填空题
一封电子邮件由（）和邮件体两部分组成。
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