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