单项选择题

Don't put off until tomorrow ______ should be done today.

A. that
B. what
C. is
D. when

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单项选择题

What did the science professors learn after the experiment（）

A．They should change the way they teach.
B．A poem could be explained in clear definitions.
C．A poetry class could be more informative.
D．Their teaching was an enjoyable experienc

单项选择题

Finding levels of meaning is （）

A．important for graduate students in humanities
B．difficult for graduate students in humanities
C．common for undergraduate students in science
D．easy for undergraduate students in science