单项选择题

Very. few people could understand the lecture the professor delivered because its subject was very ______.

A. intriguing
B. indefinite
C. obscure
D. dubious
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单项选择题
The course normally attracts 30 students per year, ______ up to half will from overseas.
A. in which
B. for whom
C. with which
D. of whom
单项选择题
______ human behavior may be caused by eating substances that upset the delicate chemical balance in the brain.
A. Deliberate
B. Consistent
C. Primitive
D. Abnormal
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