单项选择题

A．Neither of the two types of rockets is very economical.
B．The liquid-fuel rocket is best.
C．Each type of rocket has certain advantages.
D．The solid-fuel rocket is best.
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单项选择题
A．He is starting the course late.B．The subject is difficult for him.C．The professor is very reserved.D．The book is difficult to read.
A．He is starting the course late.
B．The subject is difficult for him.
C．The professor is very reserved.
D．The book is difficult to read.
单项选择题
A．For a few weeks.B．For a few months.C．For a few days.D．For almost a year.
A．For a few weeks.
B．For a few months.
C．For a few days.
D．For almost a year.
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