题目内容

Some of the studies show positive results, ______ others do not.

A. however
B. although
C. whereas
D. nevertheless

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We shall never ______ to a conqueror.

A. want
B. need
C. give
D. yield

The plane is going to take off. Please __________ from the Internet and switch off your mobiles

A. disinfect
B. discharge
C. disobey
D. disconnect

Security cameras have _______________ in the city center.

A. being installed
B. been installed
C. toinstall
D. installed

What does that mean in ________ terms?

A. concern
B. correct
C. concrete
D. concord