单项选择题

When you read books, you had better make marks ______ you have questions.

A．where
B．in where
C．at which
D．which
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单项选择题
Which of the following is NOT true about the poor American defined by the American government
A．He has a car, air conditioning, a refrigerator and a microwave.
B．He has two color televisions and cable or satellite TV reception.
C．His house is not very crowded.
D．He provides enough money to satisfy all the needs for the whole family.
单项选择题
Which of the following is NOT true according to the passage
A．Colleges may take different policies in online courses.
B．Some schools allow students to mix online and face-to-face credits.
C．Students choose online courses for different purposes.
D．Online courses are much easier to pass than traditional course.
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