生活中常见的三种物质：①柠檬汁，②肥皂水，③食盐水。柠檬汁能使

【名词&注释】

肥皂水(soapsuds)、第一个(first)、食盐水(salt water)、可数名词(countable nouns)、柠檬汁(lemon juice)

[单选题]生活中常见的三种物质：①柠檬汁^{(lemon juice)}，②肥皂水，③食盐水。柠檬汁^{(lemon juice)}能使紫色石蕊试液变红，肥皂水显碱性，食盐水的pH=7。它们的pH由小到大排列，正确的是

A. ①②③
B. ①③②
C. ②①③
D. ③①②

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学习资料：

[单选题]（B）Lifein30yearswillbe36becausemanychangeswilltakeplace,butwhatwillthechangesbe?

A. Thepopulationisgrowingfast.Therewillbe37peopleintheworldandmostofthemwilllivelongerthanbefore.
B. Computerswillbe38smallerandmoreuseful,andtherewillbeatleastoneineveryhome.Andcomputerstudies
C. willbeoneoftheimportant39inschool.
D. Peoplewillworkfewerhoursthantheyaredoingnow,andtheywillhavemorefreetimeforsports,watchingTVand
E. traveling.Travelingwillbemuchcheaperand40.Andmanymorepeoplewillgotoothercountries41holidays.
F. Therewillbechangesinourfood,too.Morelandwillbeusedfor42newtownsandhouses.Thentherewillbeless
G. 43forcowsandsheep,someatwillbemoreexpensive.Maybepeoplewon’teatiteveryday,theywilleatmorevegetablesandfruitinstead.Maybepeoplewillbehealthier.
H. Workinthefuturewillbedifferent,too.Dangerousandhardworkwill44byrobots.Becauseofthis,manypeoplewill
I. nothave45todo.Thiswillbeaproblem.
J. 36_______.
K. same
L. difference
M. different
N. difficulty

[单选题]19．

A. a lot
B. lot of
C. many
D. much

[单选题]17． Both Jim and Kate _________in Beijing now． They both________ from Amer-ica．

A. is； come
B. are； come
C. is ；comes
D. are ； comes

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