【正文】 ：（I） 設(shè)等差數(shù)列 （II）數(shù)列的前項(xiàng)和 == 解：（I） 所以函數(shù)解：（I）由已知，BC邊在x軸上，AB邊所在直線的斜率為1，所以∠B=45176。二、詞匯與語(yǔ)法知識(shí)從每小題的四個(gè)選擇項(xiàng)中，選出最佳的一項(xiàng)，并把它前面的大寫(xiě)字母填入左邊的括號(hào)里。 has bee built 。 became built。 older。 old。 shoe。 shoes。 deep。 deeply。 be excited 。 is excited。 is repairing damaged。 repaired damaged。 to take。 to take go。 is 。 are 。s surface is covered with water. But about 97 percent of 1 is seawater or salt water. Man can only drink and use the other 3 percent — the fresh water that 2 rivers, lakes and other sources.Now, the need 3 water is increasing day by day. Only when steps 4 to deal with this problem 5 save some water for the future. A 6 water supply would affect agriculture and industry. So we should all learn how to stop 7 . One of the steps is researching ways to 8 it . But even if water is reused, there still would not be enough. Other sources would 9 . Where could people turn 10 ?The oceans seem to 11 the best answer. There is plenty of water in the oceans. All that needs to be done is to 12 the salt from the seawater. This process（過(guò)程）is expensive but it is already 13 in many parts of the world. So 14 if we take these steps, we’ll not be 15 drying up.( ). this( ). takes out of from out of from( ). for D. in ( ). are used taken( ). we will we could we( ). limitsB. limit( ). from wasting waste waste( ) use( ) found be found to be found( ) last( ) to( ) ( ) use use ( ) look look see watch( ) of danger of danger with（二）It must have been nine o’clock yesterday evening when I drove back home from work. As I enter the gate, I 1 the headlamps of the car so as to prevent the light 2 in through the window and waking Jack, who shared the house 3 me. But I noticed that his light was 4 on. After I put the car away, I went to jack’s room. He was in bed 5 but he didn’t 6 turn towards me.“What’s up, Jack?” I said.“My goodness. Don’t make a noise. ”He 7 .“Take your shoes off.”The way he spoke reminded me 8 someone in pain. I thought that he must be ill and that I’d better 9 him feel happy.“There is a snake here ,”he explained. “It’s asleep between sheets. I was 10 my back reading when I saw it. I knew that moving was out of 11 It hasn’t bitten me yet but I 12 anything to wake it up. I 13 that you’d be home an hour ago. I was 14 to call a doctor.”There was no time to argue or apologize 15 late. I looked at him as encouragingly as I could and went out to telephone the doctor.( ). turned onB. put offC. switchedD. switched off( ). to swingB. to reachC. from swingingD. reach ( ). inB. withC. fromD. to ( ). alreadyB. stillC. yetD. to be( ). awakenB. awokeC. awakeD. wake( ). evenB. stillC. onlyD. rather( ). smiledB. criedC. shoutedD. whispered( ). offB. onC. to D. of( ). makeB. getC. causeD. fort( ). lying inB. laying on C. lain inD. lying on( ). questionB. questionsC. the questionD. the questions( ). dare toB. dare not doC. dare not to doD. dare to do( ). took for granted C. took it for grantedB. took grantedD. took it granted( ). expected of you C. wishing youB. expecting youD. going( ). for being C. on beingB. to be D. to have been四、閱讀理解（一）The volcano is one of the most surprising and frightening forces of nature. Maybe you have seen pictures of these “fireworks” of nature. Sometimes when a volcano erupts, a very large wall of melted rock moves down the side of a mountain. It looks like a “river of tire.”Sometimes volcanoes explode, throwing the melted rock and ashes(灰)high into the air. But where does this melted rock e from? Most people think of mountains when they think of volcanoes. But not every mountain is a volcano. A volcano is simply the opening in the earth from which the magma escapes. The hot magma, or lava as it is called, cols and builds up on the surface of the earth. Over thousands of years, this pile of cooled lava can grow to be very, very big. For example, the highest mountain in Africa, Kilimanjaro, is a volcano. It towers more than 16,000 feet above the ground around it. （ ）A. moves down B. breaks away （ ） A. “Volcano” and “explode”. B. “Crust” and “ hard rock” is the correct order of the layers of the earth(beginning with the top layer)? B. crusthard rock soft rockmagma C. magmasoft rock hard rockcrust best title(標(biāo)題) of the passage should be . C. The Mountains D. The Melted Rock （二）When our telephone was installed(安裝)，my father paid no attention to it unless he thought we were talking too long。 passage tells us about . A. a family affair B. a telephone’s story C. a factory worker’s life D. a social problem（ ） was father staring at the telephone that evening? A. Because he was worrying about his work. B. Because he knew what his ing retirement woud mean. C. Because it reminded him of his pany. D. Because he was worried that his children would not use it any more because of money（ ） of his students didn’t agree that .A. the teacher should have so many questionsB. the teacher had as many questions as the students.C. the students had more questions than the teacherD. the teacher had more questions than the students（ ）