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

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

单项选择题What’s （）in the bone will come out in the flesh.

A.bred
B.inserted
C.raised
D.broken