问题 选择题

下列离子方程式书写正确的是

A.在强碱溶液中次氯酸钠与Fe(OH)3反应生成Na2FeO4

3ClO+2Fe(OH)3 ="2" FeO42+3Cl+H2O+4H

B.4mol/L的NaAlO2溶液和7mol/L的HCl等体积互相均匀混合

4AlO2+7H+H2O=3Al(OH)3↓+Al3

C.向NaAlO2溶液中通入过量CO2 2AlO2+CO2+3H2O = 2Al(OH)3↓+ CO32-

D.NaHSO4溶液中滴入Ba(OH)2溶液至中性:H++SO42-+Ba2+十OH-=BaSO4↓+H2O

答案

答案:B

A错,强碱性溶液中不可能生成氢离子;B正确;C错,正确为:AlO2+CO2+2H2O = Al(OH)3↓+ HCO3-;D错,正确为:H++2SO42-+2Ba2+十OH-=2BaSO4↓+H2O;

完形填空
When your mother want to tell you something, she uses words. Birds can’t speak 1._____ we do, but some birds can make sounds to warn their young of 2._______.They have 3.________own way of making the young birds do certain things.
The jackdaw is a kind of black bird4.______lives in Europe. Jackdaws live together in flocks. Young jackdaws do not know their enemies. When an old jackdaw sees a dog, it makes a loud rattling5.______.The young birds know this sound means6._______is nearby. The sound warns them7._______their enemies.
8._______ a young jackdaw is in a 9______ place, a jackdaw parent 50._______over the young bird’s back from behind. The parent’s tail feathers move 11.______from side to side. It’s trying to say “12______”.At the same time, the 13.________bird calls out Key-aw Key-aw, which seems to say FLY HOME WITH ME. The young bird then follows the older14_______to go home.
Young jackdaws15._______ learn what certain sounds mean. They know the meaning of these sounds from they hatch.
小题1:
A.like B.asC.look likeD.seem
小题2:
A.safeB.comingC.dangerD.eating
小题3:
A.themB.themselvesC.hisD.their
小题4:
A.thatB.whoC./D.where
小题5:
A.soundB.voiceC.noiseD.sounds
小题6:
A.parentsB.an enemy C.motherD.a friend
小题7:
A.meetingB.to meetC.knowingD.to know
小题8:
A.IfB.UnlessC.WhetherD.Because
小题9:
A.funnyB.dangerousC.secretD.far
小题10:
A.fliesB.flyC.will flyD.flew
小题11:
A.quickB.soonC.quicklyD.quietly
小题12:
A.Be quickB.I love youC.Go aheadD.Follow me
小题13:
A.parentB.childC.enemyD.parents
小题14:
A.itB.oneC.onesD.that
小题15:
A.have toB.mustC.don’t have toD.mustn’t