单项选择题

Why will Boeing not need a replica of the 777

A．It can use computers to check the design.
B．It already has enough experience with plans.
C．It will only need to upgrade the replica of the previous model.
D．It can make sure all the bits fit together.

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热门试题

单项选择题

What is the main theme of the passage

A．The fact that a student was able to make an atomic bomb:
B．The dangers of transporting plutonium.
C．The fact that secret information is available in public libraries.
D．The ease with which atomic bombs could become a terrorist weapon.

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