The bright plumage of many male birds has （） to attract females.

单项选择题Scientists （）the animals’ environment in order to study them.

A.duplicate
B.imitate
C.remake
D.reproduce

单项选择题Fifteen is a little young to（）a serious long－distance relationship.

A.talk down to
B.be pressed into
C.be convinced of
D.be involved in

单项选择题Our English teacher always emphasizes the importance of learning new words in context rather than learning each of them（）.

A.individually
B.exclusively
C.approximately
D.supposedly

单项选择题He（）the bottle he put on the top of the shelf on Friday，but couldn’t find it.

A.reached for
B.arrived at
C.figured out
D.dealt with

单项选择题Her grandparents lost everything during the（）in the thirties.

A.reservation
B.revelation
C.resolution
D.revolution

单项选择题They are the sort of friends who are so close they（）each other with their lives.

A.depend
B.forgive
C.trust
D.believe

单项选择题Huge solar mirrors are put in orbit around Mars to（）the polar ice－caps.

A.warm
B.heat
C.heaten
D.enheat

单项选择题In Africa，there were tribes which （）stretching the ear lobes.

A.went in for
B.went for
C.went
D.went to

单项选择题Since the beginning of history, people have（） travel.

A.dreamed
B.dreamed for
C.dreamed of
D.dreamed with

单项选择题His stupid remarks （）a fight.

A.touched down
B.touched on
C.touched off
D.touched up