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Myuncleisaworker.Heworksinaf_____

Pleasegive_____(I)acupoftea.

翻譯下面的短語

1.二瓶果汁___________

2.到這來___________

3.在樹下___________

4.雙胞胎兄弟___________

5.howmuch___________

6.thanksalot___________

7.lookafter___________

8.puton___________

9.在天空中___________

10.穿紅衣服的女孩___________

兩種硫酸鹽按一定比例混合后共熔，可制得化合物X，X溶于水能電離出K+、Cr3+、2SO4，若將2.83gX中的Cr3+，全部氧化為2Cr2O7

后，溶液中的2Cr2O7可和過量KI溶液反應，得到3.81gI2，反應的離子方程為若向溶有2.83gX的溶液中，加入過量的BaCl2溶液，可得到4.66g白色沉淀.由此可推出X的化學式為()

JackisateacherofEnglish.Heisnotyoung，butheisnotold.Hehasaroundfaceandblackhair.Heistall.Therearefiftystudentsinhisclass.Theyalllikehim.Nowit'sintheafternoon.Look，somestudentsareworkingintheclassroom.Jackisthere，too.HeishelpingthemtostudyEnglish.Heisagoodteacher，andheisagoodfriendofthemall.

()1.WhatdoesJackdo?

A.Heisaworker.

B.Heisateacher.

C.Heisadoctor.

D.He'sanurse.

()2.Whatcolourishishair?

A.It'sblack.

B.Hisheiriswhite.

C.Itisbrown.

D.Hehasyellowhair.

()3.Howmanystudentsarethereinhisclass?

A.Therearefifteenstudentsinhisclass.

B.There'sfifty.

C.Hehasfifty.

D.There'refiftyinit.

()4.Jackisagoodteacher，isn'the?

A.Yes，heisn't.

B.No，heis.

C.Yes，he's.

D.Yes，heis.

()5.Whatarethestudentsdoingintheclassroom?

A.Theyarewalkingthere.

B.Theyaredoingtheirlessons.

C.Theyarehelpingtheirteacher.