研究性学习的实施途径主要有（）、（）和（）三种。
参考答案：单独设置；综合性学科中的主题模块；单科性学科中的综合性专题
— The Modern Art Exhibition in the City Museum has been cancelled.
— Oh,no!______. [ ]
A. It's a pity
B. It doesn't matter
C. I knew it already
D. It's not interesting at all
Look! She is _____________ her hair.[ ]
A. comb
B. combs
C. combing
