单项选择题

Section A Questions 11 to 18 are based on the conversation you have just heard.

A．To help the man pack.
B．To look after her sister’s child.
C．To stay at home.
D．To visit her sister.
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单项选择题
A．Because it is interesting and creative.B．Because it has a big effect on our lives.C．Because she can make big money with it.D．Because she can graduate more easily.
A．Because it is interesting and creative.
B．Because it has a big effect on our lives.
C．Because she can make big money with it.
D．Because she can graduate more easily.
单项选择题
The major difficulty in developing space travel is that ______.
A．there is no clear destination in space
B．it is too risky and expensive for people to go beyond the orbit
C．the current space propulsion systems can not meet the needs for the long space travel
D．there is not enough energy for spacecraft to gain velocity
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