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Onedayateacherwasgivingaspeechtohisstudents.Heheldup（举起）aglassofwaterandaskedtheclass."Howheavydoyouthinkthisglassofwateris?"

Thestudents'answersranged（范围）from20gto500g.

"Itdoesnotmatterontheweightitself.Itdependsonhowlongyouholdit.IfIholditforaminuteitisOK.IfIholditforanhourIwillhaveanacheinmyrightarm.IfIholditforadayyouwillhavetocallanambulance（救护车）.ItisexactlythesameweightbutthelongerIholdittheheavieritbecomes."

"Ifwecarryourburdens（负担）allthetimesoonerorlaterwewillnotbeabletocarryontheburdenbecomingincreasinglyheavier."

"Whatyouhavetodoistoputtheglassdownrestforawhilebeforeholdingitupagain."

Wehavetoputdowntheburdensometimessothatwecanberefreshedandareabletocarryon.

Sobeforeyoureturnhomefromworktonightputtheburdenofworkdown.Don'tcarryitbackhome.Youcanpickituptomorrow.

Whateverburdensyouarehavingnowonyourshouldersletitdownforamomentifyoucan.

1.Theteacherbroughtaglassofwatertotheclassbecause______

A.hewasverythirsty B.hisarmswerestrong C.itwasagoodexample

2."Aglassofwater"inthispassagereferredto（指）______

A.knowledge B.theburden C.thetime

3.Accordigntotheteacheryoumayfeel______ifyouputdowntheburdensometimes.

A.moreenergetic B.muchheavier C.morestressedout（压力、紧张）

4.Thiswasalessonabout______

A.howtorelaxoneselfinlife B.howtosolveaphysicsproblem.

C.howtokeepfitbydrinkingwater

5.WhichofthefollowingstatementsisTRUEaccordingtothepassage?

A.Youcouldbecomeheavierandheavierifyouheldaglassofwaterinyourhand.

B.Allthestudentsintheclassknewwhattheweightoftheglassofwaterexactlywas

C.Theteacherhadagoodwayofmakinghislessonclearandeasytobeunderstood