题目

已知四边形是边长为1的正方形，点E是射线上的动点，以为直角边在直线的上方作等腰直角三角形，，设．（1）如图1，若点E在线段上运动，交于点P，交于点Q，连结，①当时，求线段的长；②在中，设边上的高为h，请用含m的代数式表示h，并求h的最大值；（2）设过的中点且垂直于的直线被等腰直角三角形截得的线段长为y，请直接写出y与m的关系式． If you have to choose a “Person of the Year” for 2005 , who will you pick ？For many of us ,the choice might not be a person at all . It would be Mother Nature（大自然母亲）. While the world was still getting over the Indian tsunami（海啸）of December 2004 . Mother Nature went on showing her power throughout 2005 . From July to October, about seven typhoons（台风）hit China’s coastal（沿海的）area.In August , the whole New Orleans city in the US was hit with its worst 一ever natural disaster , Hurricane Katrina . In early October , an earthquake in Pakistan killed more than 70,000 people . Mother Nature was trying to give us a message:humans need to take responsibility（duty ) for the earth . She was just fighting back . It is we humans who burn coal and oi1 to make electricity and power cars . This makes huge amount of greenhouse gases , which cause global warming . It is we humans who cut forests and fill lakes to make space for buildings.This leaves fewer trees and lakes to keep floods（洪水）from rushing to towns and cities . We need to work hard to ease（缓解）Mother Nature’s anger , or we’11 see more years of disasters.For example , we can start to use less electricity . Turn off lights , TVs and computers when we’re not using them . We can plant trees . One new tree a year from each of us can make a forest. Forests not only hold floods , they also take in greenhouse gases. 1 . The second paragraph mainly shows that_____________. A . the Indian tsuami brought the people serious disasters B . people in the world haven’t forgotten the Indian tsuami yet C . people in  Indian areas are still overcoming difficulties and rebuilding D . “Person of the Year” for 2005 is Mother Nature 2 . Why may Hurricane Katrina be the worst 一ever natural disaster in American recent history ? A . Because the whole New Orleans City in America was destroyed badly . B . Because a few meters high water waves crashed the walls . C . Because it has never happened in the United States . D . Because the people in New orleans were both out of water and food. 3 . What can cause such a serious disaster according to the passage ? A . People burn coal and oi1 .              B . People cut down a lot of trees . C . People change the lakes into fields .  D . All the answers above . 4 . The underlined phrase“take in” means “_____________” in Chinese . A .放出                 B .挥发              C .吸收              D .制造 5 . The passage mainly tells us _____________. A . to use less electricity and plant more trees B . why the globe is getting warmer and warmer C . that people should protect and love the earth D . how to improve the environment around us