单选题：Peoplenowenjoylongerlivesforunknownreasons.

题目内容：

Peoplenowenjoylongerlivesforunknownreasons. A．Right
B．Wrong
C．Notmentioned

参考答案：

答案解析：

Inthe1950stheAmericangovernmentfinallytookactiontobuildanati

Inthe1950stheAmericangovernmentfinallytookactiontobuildanationalhighwaysystem.

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