2（）

单项选择题The underlined phrase blew up , in paragraph 2, is closest in meaning to （）.

A．improved a lot
B．saved much energy
C．got outdated
D．broke down

单项选择题The American Automobile Association Foundation for Traffic Safety plans to （）.

A．replace straight, horizontal bars with chevrons
B．change the road signs across the country
C．try out the Japanese method in certain areas
D．repeat the Japanese road patterns