Whilecrossingthemountainarea,allthemencarriedgunslestthey______bywildanimals.

妊娠合并病毒性肝炎孕妇，临近预产期有出血倾向，治疗时应选用的药物是（）

Theagriculturalrevolutioninthe19thcenturyinvolvedtwothings：theinventionoflabor-savingmachineryandthedeyelopmentofscientificagriculture.Labor-savingmachinerynaturallyappearedfirstwherelaborwasscarce.“InEurope，”saidThomasJefferson，“theobjectistomakethemostoftheirland，laborbeingabundant：hereitistomakethemostofourlabor，landbeingabundant.”ItwasinAmerica，therefore，thatthegreatadvancesin19thcenturyagriculturalmachineryfirstcame.

Attheopeningofthecentury，withtheexceptionofacrudeplowfarmerscouldhavecarriedpracicallyalloftheexistingagriculturalimplementsontheirbacks;by1860，mostofthemachineryinusetodayhadbeendesignedinanearlyform.Themostimportantoftheearlyinventionswastheironplow.Asearlyas1790CharlesNewboldofNewJerseyhadbeenworkingontheideaofacast-ironplowandspenthisentirefortuneinintrodueinghisinvention.Thefarmers，however，wouldhavenoneofit，claimingthattheironpoisonedthesoilandmadetheweedsgrow.Nevertheless，manypeopledevotedtheirattentiontotheplow，untilin1869JamesOliverofSouthBend，Indiana，turnedoutthefirstchilled-stillplow.?

1.Whatisthemaintopicofthepassage?

a.Theneedforagriculturaladvancestohelpfeedagrowingpopulation.

b.Thedevelopmentofsafermachinesdemandedbythelabormovement.

c.Machinerythatcontributedtotheagriculturalrevolution.

d.NewJerseyasaleaderintheagriculturalrevolution.

2.Theexpression“makethemostof”inLine4isclosestinmeaningtowhichofthefollowing?

a.getthebestyieldfrom

b.raisethepriceof

c.makefulluseof

d.earnalivingon

3.WhichofthefollowingcanbeinferredfromwhatThomasJeffersonsaid?

a.EuropewaschangingmorequicklythanAmerica.

b.EuropehadgreaterneedoffarmmachinerythanAmericadid.

c.Americawasfinallyrnningoutofgoodfarmland.

d.TherewasashortageofworkersonAmericanfarm.

4.Itcanbeinferredthatthewaord“here”inLine4refersto_____.a.Europe

b.America

c.NewJersey

d.Indiana

5.Whatpointistheautormakingbystatingthatfarmerscouldcarrynearlyalltheirtoolsontheirbacks?

a.Farmershadfewtoolsbeforetheagriculturalrevolution

b.Americansweretraditionallyself-reliant.

c.Lifeonthefarmwasextremelydifficult.

d.Newtoolsweredesignedtobeportable.

犬，体温40℃，呕吐，排番茄汁样稀粪。患犬粪便上清滤过除菌后可凝集猪红细胞。该病最可能的病原是

结核菌素试验结果描述正确的是（）