What can we learn from Servals words in Paragraph 3？
A. You will find it enjoyable to see a dentist.
B. You should see your dentist on a day-to-day basis.
C. You can brush with the Kolibree as if guided by a dentist.
D. You"d like a dentist to watch you brush your teeth every day.
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Speaker A:Its terrible. I cant make anything out of this lecture. Speaker B:______. Im thinking of dropping the courses.
A. Neither can I
B. I know nothing about it
C. It"s dead simple
D. The professor speaks well
Doctor:______Patient: Ive got a bad cold and got a sore throat.
A. Do you have anything to declare, sir？
B. Good morning! May I help you？
C. How have you getting along recently？
D. What seems to be the problem？
【C20】
A. at
B. over
C. under
D. on
Speaker A: Oh, I am sorry. I just realized that I forgot to bring the tape recorder you lent me. I left it in the dorm.Speaker B: Thats all right.I wont need it until tonight.______.
A. It would be OK till then
B. So long as I"ll have it then
C. As long as I have it by then
D. And I don"t think you won"t give it to me by then
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