题目内容

It was reported that two famous _______would attend that conference.

A. woman scientist
B. women scientist
C. woman scientists
D. women scientists

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We must keep______with the rapid development of the world economy.

A. move
B. step
C. speed
D. pace

I have a bad toothache, so I have to go to_____ as soon as possible.

A. dentist's
B. the dentist's
C. dentist
D. dentists

To make matters worse, the_____of this infectious disease still remains unclear.

A. reference
B. request
C. resource
D. origin

A nuclear accident would have serious _____for the environment, so we should be careful.

A. effects
B. influences
C. consequences
D. endings

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