单项选择题

Questions 11 to 18 are based on the passage you have just heard.

A．Mr. Smith.
B．Mr. Johnson.
C．The woman.
D．Mr. Black.
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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.
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.
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.
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