单项选择题

设计一课时的数学课外练习不包括下面哪个选项（）

A.实用性
B.新颖性
C.阶段性
D.开放性

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Research questions should be narrow enough and be stated in a clear and simple way.

答案：正确

单项选择题

“Beauty is truth, truth beauty” is the most famous words of the poem ______.

A．Hyperion
B．“To a Skylark”
C．“Ode on a Grecian Urn”
D．Don Juan