单项选择题

The ultimate purpose of the research is to ______.

A．have a better understanding of the life of mosquitoes
B．prevent human beings from being bitten by mosquitoes
C．purify the environment
D．keep people healthy

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单项选择题

According to the man which one is NOT the possible factor of success

A．Patience is necessary.
B．We should be blessed with luck.
C．Hard working.
D．A good understanding of the teamwork spirit.

单项选择题

What does not contribute to an actor's performance in a movie

A．The directions of the movie director.
B．The support of the firm crew.
C．The effort of the actor.
D．The editing of the movie.