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【单选题】
牙周病的病因，正确的是 ( )A.
菌斑可引起牙周病
B.
食物嵌塞可引起牙周病
C.
全身疾病可引起牙周病
D.
创伤可引起牙周病
E.
以上均是
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【简答题】听力原文：When I left school I went to university here in Nairobi. I studied electronics end communications. I finished studying in 1992 and then I got my first job. That was with Siemens. I stayed there f...
【单选题】When I left my office, I saw the headmaster _________ to some students at the school gate. [ ]
A.
talk
B.
talking
C.
talks
D.
to talk
【简答题】The five key values of journalism mentioned by Aidan White are _______________, ________________, _____________, ________________, and __________________.
【简答题】听力原文： When I left school I went to university here in Nairobi. I studied electronics and communications. I finished studying in 1992 and then I got my first job. That was with Siemens. I stayed there ...
【单选题】By the time I got to school, I realized I_________ my backpack at home. [ ]
A.
left
B.
had left
C.
was leaving
D.
had forgotten
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