Look at Tom! What（）?
A.does he do
B.is he doing
C.he is doing
参考答案：B
_____ want to visit the Great Wall.[ ]
A. Half students
B. Half of the student
C. Each of students
D. Many the students
支气管扩张症合并咯血时治疗一般不主张应用（）
A.抗生素
B.止血药
C.镇咳药
D.支气管扩张药
E.镇静药
