This rare bird has become（）

单项选择题Is $50 equivalent（）about £30?

A.to
B.for
C.with
D.on

单项选择题I think this sofa is（）than that one.

A.expensiver
B.more costly
C.cost more
D.cos tlier

单项选择题Someone over 18 years old is（）under British law.

A.adult
B.grow-up
C.an adult
D.grown-ups

单项选择题They are（）children because they do not have enough to eat.

A.Unhealthy
B.inhealthy
C.inhealth
D.unhealth

单项选择题The company plans to shut（）four factories and cut 1,000 jobs.

A.out
B.down
C.away
D.off