高一下学期英语期中考试试卷第21套真题

高一下学期英语期中考试试卷一、阅读理解1. 根据短文理解，选择正确答案。

You may like chewing gum after meals to stop your breath smelling bad; or your mother might use a special neutralizer to protect her permed hair . But have you thought about the chemical principles behind such everyday actions?On March 2, the Senior 3 students from the IB classes at Beijing Huijia Private School presented their discoveries, all in fluent English. This kind of seminar is held every year to show the achievements of the IB chemistry experiment lessons offered by the school. IB is a qualification based on a common curriculum for students aged 16-18 in any country and is recognized by universities everywhere.“Once I saw an advertisement for xylitol gum,” recalled Zhang Xinju. “Suddenly an idea came to my mind: are there any chemical reactions when the xylitol is working on our teeth?”Zhang and his partner Bu Xuan visited several hospitals to try and findout. “Doctors know that xylitol can protect teeth, but few could explain how the che mical reactions happen,” said the 17-year-old boy.Presenting the results of their research in English to an audience of Chinese and foreign judges was never a problem for the students.“Textbooks for IB students are in English, and our teachers speak in English,” explained Wei Duan and Han Yu, whose research topic was “The Acid-Base Reaction in the process of Hair-Perming”.“In Senior 1 we often referred to Chinese textbooks, but we found we could understand and express it all in English by the second year.”Lu Jiang, the school’s IB chemistry teacher and China’s only IB vice-examiner, is proud that her students can apply scientific theories they learn in class to daily life.“You might have learned these facts from you kindergarten teachers, but few think about the theories behind them,” Lu said. “This kind of practice is intended to develop the scientific thinking they will need in their future studies.”（1）IB is recognized by____________.A . Beijing Huijia Private SchoolB . univercities in ChinaC . schools in Engkish-speaking countriesD . universities in any country（2）which statement is true?____________A . Doctors don’t know that xylitol can protect teethB . Doctors can explain how the chemical reactions happenC . Few could explain how the chemical reactions happen.D . The foreign doctors can explain how thechemical reactions happen（3）Textbooks for IB students are in___________A . ChineseB . EnglishC . English and ChineseD . Japanese（4）From the passage,we know_______A . the students are creativeB . the students are poor in ChineseC . the students don’t like chewing gumD . The students are hard-working （5）From the passage,we can infer _________________________A . we only need to work hard in our studyB . we must learn English wellC . we should intend to develop the scientific thinking in our studiesD . we should have more time to play2. 根据短文理解，选择正确答案。

Memory, they say, is a matter of practice and exercise. If you have the wish and really made a conscious（自觉的）effort, then you can quite easily improve your ability to remember things. But even if you are successful, there are times when your memory seems to play tricks on you.Sometimes you remember things that really did not happen. One morning last week, for example, I got up and found that I had left the front door unlocked all night, yet I clearly remember locking it carefully the night before.Memory “trick” work the other way as well. Once in a while you remember not doing something, and then find out that you did. One day last month, for example, I was sitting in a barber（理发师）shop waiting for my turn to get a haircut, and suddenly I realized that I had got a haircut two daysbefore at the barber shop across the street from my office.We always seem to find something funny and amusing（有趣的）in incidents caused by people’s forgetfulness or absent-mindedness. Stories about absent-minded professors have been told for years, and we never got tired of hearing new ones. Unfortunately, however, absent-mindedness is not always funny. There are times when “trick” of our memory can cause us great trouble.（1）If you want to have a good memory, .A . you should force yourself to remember thingsB . you should make a conscious effort of practice and exerciseC . you should never stop learningD . you should try hard to remember tings（2）Which of the following statements is true according to the passage?A . One night the writer forgot to lock the front door.B . One night the writer forgot having locked the front door.C . The writer remembered to lock the door.D . the writer remembered unlocking the front door.（3）From the sentence “We never get tired of hearing new ones”, we can infer that .A . we enjoy hearing new stories about absent-mindedness of professorsB . we don’t want to know anything more about absen t-mindedness of professorsC . we will never get tired of listening to new stories about absent-mindednessD . absent-mindedness happens not only to professors but to many other people（4）In the passage, the writer seems to tell you .A . forgetting things is serious and dangerousB . always forgetting things is understandableC . forgetting things at times is naturalD . the way to protect yourself from memory “tricks”（5）The best title for this passage is .A . How to Get a Good MemoryB . “Tricks”of MemoryC . Forgetfulness and absent-mindedness is DangerousD . Get rid of Absent-mindedness3. 根据短文理解，选择正确答案。