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【单选题】
影响牙石形成的因素是A.
唾液成分
B.
菌斑量
C.
口腔卫生习惯
D.
修复体的光洁度
E.
以上均是
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举一反三
【单选题】Why did Peter's mother call the Office of Students' Affairs?
A.
To arrange for some activities for Peter.
B.
To complain about Peter's rommmate.
C.
To introduce Peter to the staff there.
D.
To find out why Peter feels unhappy.
【简答题】请简述MTO的含义、责任和经营的范围
【单选题】--My father ___________ a letter yesterday, but I’m not sure if he has finished it. ---Why not ask him about it ?
A.
wrote
B.
was writing
C.
has written
D.
writes
【单选题】I can always ask Peter for help if I have problems. He is _____. [ ]
A.
friendly
B.
hard-working
C.
helpful
D.
funny
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