问题 选择题

关于环境自净能力的理解,正确的是

A.人类的破坏能力越大,环境的自净能力越强

B.由于环境具有自净能力,所以不会发生严重的环境问题

C.环境的自净能力是有限度的

D.当人类向环境排放过量污染物,环境会永久丧失容纳和清除能力而发生环境问题

答案

答案:C

题目分析:环境自净能力是指自然环境对人类排放的污染物具有容纳和消除的能力,环境具有自净能力,但有一定的限度。当人类向环境中排放的污染物超过环境的自净能力时,便会产生环境污染现象。

点评:本题难度低,知识性试题,学生只要掌握环境自净能力的概况和基本特征即可判断。

完形填空
Do you like travelling? Today, I’ll give you some      about travelling. You should have a good night’s sleep        you travel. If you don’t, you will feel tired       the way. You should take some      with you. It may be helpful when you feel sick. You should have a meal before travelling. If you         eat anything, you’ll feel hungry. And the food on the train is much more         .You should listen to the weather report earlier, so you can       a good plan for your travel. You’d better take a(n)       with you. It can keep off the sun and the rain. You should        all your right clothes when you prepare your luggage(行李). If you’re going from a hot place to a cold place, you have to       some warm clothes. You should drink enough water. Don’t wait to be     . You’d better take some water       you can have a drink when you want to drink. You should write down all the travel      : departure(出发) and arrival time, bus or train number, your parents’ names , address and phone number and so on. You should take a        . You can take lots of photos when you see beautiful scenery. When you come back, you can show the pictures to your friends. Above all,      yourself when you are travelling. But please look after yourself and your things carefully.
小题1:
A.ideaB.adviceC.nameD.time
小题2:
A.beforeB.afterC.whileD.as
小题3:
A.inB.byC.onD.at
小题4:
A.waterB.drinkC.foodD.medicine
小题5:
A.notB.won’tC.doesn’tD.don’t
小题6:
A.difficultB.differentC.expensiveD.delicious
小题7:
A.makeB.getC.findD.put
小题8:
A.raincoatB.bagC.boxD.umbrella
小题9:
A.wearB.pack(打包)C.put onD.have on
小题10:
A.takeB.carryC.bringD.have
小题11:
A.hungryB.sadC.happyD.thirsty
小题12:
A.in order toB.so thatC.thoughD.if
小题13:
A.kindB.wayC.informationD.place
小题14:
A.radioB.TVC.computerD.camera
小题15:
A.enjoyB.helpC.forgetD.report
单项选择题