D

　　The Leaning Tower of Pisa has gone against the laws of gravity for seven and a half centuries.Every year，on June 19th，a professor from the University of Pisa climbs to the bell tower and measures the increase in the slant(傾斜) with special instruments.And every year the professor makes the same report：the tower has learned a bit—about an inch more.Last summer(the year of 2004)，the 125­foot­high tower was leaning an incredible 15 feet out of line.Scientists say that unless a way is found to stop the slant，the tower will collapse in less than 80 years.

　　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　主旨大意題。文章主要介紹塔的一些情況，而不是關(guān)于a plan for saving the tower，更不是單純說明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　推理判斷題。見第一段第三句、第四句“And every year...about an inch more”，“Last summer...15 feet out of line”可斷定“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

　　B.to prevent the bell in the tower

　　C.to protect the foundation

　　D.to keep the soil at the tower

　　解析　推理判斷題。見第二段最后兩句。

　　答案　C

　　50.According to the way it is written，this passage is more like ________.

　　A.a funny history story 　B.a serious tour advertisement

　　C.an exciting announcement 　D.a common science report

　　解析　推理判斷題。根據(jù)全文可知D為最佳答案。

　　答案　D