单项选择题

What is the author's main concern

A．How to render automobiles pollution- free.
B．How to make smaller and safer automobiles.
C．How to solve the problem of traffic jams.
D．How to develop an automated subway system.

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单项选择题

According to the passage, some people started a national association so as to ______

A．block any legislation to ban the private possession of the bomb
B．coordinate the mass production of the destructive weapon
C．instruct people how to keep the bomb safe at home
D．promote the large-scale sale of this newly invented weapon

单项选择题

From the tone of the passage we know that the author is ______

A．doubtful about the necessity of keeping H-bombs at home for safety
B．unhappy with those who vote against the ownership of H-bombs
C．not serious about the private ownership of H-bombs
D．concerned about the spread of nuclear weapons