There _______a knock at the doorjust now .
A. will be
B. has been
C. were
D. was
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Therea pen and two books on the desknow.
A. are
B. be
C. is
D. was
There is _____ on the floor.
A. cat
B. water
C. boxes
D. football
——Are therefive pens on the desk?——_______________.
A. Yes, there is
B. No, there isn’t
C. Yes, there isn't
D. No, there aren’t
霍乱的治疗原则不包括:
A. 补液治疗
B. 抗菌药物治疗
C. 微生态调节剂
D. 预防治疗