The tower is leaning because the soft soil of Pisa will not support it.Its foundation is sinking into the soil at an angle，causing the tower to lean.Since a slight shake could make the foundation loose，the ringing of the tower's bells was forbidden in 1959.And trucks are not allowed to pass in the neighborhood of the tower for this same reason.

　　47．This passage is mainly about ________.

　　A．a famous tower that leans

　　B．a plan for saving the tower

　　C．the history of the Tower

　　D．the cause of the tower's slant

　　解析　主旨大意题。文章主要介绍塔的一些情况，而不是关于a plan for saving the tower，更不是单纯说明the cause of the tower's slant。

　　答案　A

　　48．This summer the tower may be found to be in the slant by ________ according to the passage.

　　A．more than one inch

　　B．exactly one inch

　　C．more than fifteen feet

　　D．exactly fifteen feet

　　解析　推理判断题。见第一段第三句、第四句“And every year...about an inch more”，“Last summer...15 feet out of line”可断定“this summer...of...more than fifteen feet”。

　　答案　C

　　49．Truck traffic has been forbidden in the neighborhood of the tower ________.

　　A．to protect all the visitors

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