根据下列材料回答下列各题。The idea of a fish

根据下列材料回答下列各题。

The idea of a fishBeing able to generate electricity strong enough to light lampBulbs—oreven to mn a small electric motoris almost unbelievable，but several kinds of fish are able todo this．Even more strangely。this curious power hasBeen acquired inDifferent waysBy fishBe。longing to veryDifferent families．

Perhaps theBest known are the electric rays，or torpedoes(电鱼)，of which several kindslive in warm seas,They posses on each side of the head，behind the eyes，a large organ consis—ting of a number of hexagonal shaped cells rather like a honeycomb．The cells are filled with ajeUy—like substance，and contain a series of flat electric plates．One side，the negative side，ofeach plate．is supplied with very fine nerves，connected with a main nerve coming from a specialpart of theBrain．Current passes from the upper，positive side of the organDownwards to thenegative，lower side．Generally it is necessary to touch the fish in two places，completing the cir-cuit，in order to receive a shock．

The strength of this shockDepends on the size of the fish，but newlyBorn ones only about5 centimeters across canBe made to light theBulb of a pocket flashlight for a few moments， while a fully grown torpedo gives a shock capable of knocking a manDown，and，if suitablewires are connected，will operate a small electric motor for several minutes．

Another famous example is the electriceel．This fish gives an even more poweIful shock．The system i8Different from that of the torped。in that the electric plates run longitudinally(纵向)and ale supplied with nerves from the spinal(脊骨)cord．Consequefitly，the c
A.the torpedo’s electric ceils have a shape with six sides
B.some fish can produce enough electricity toDrive a number of electric motors
C.the current travels in an upwardDirection from the positive side to negative sidein torpedo’s electric cells
D.the capacity to generate electricity is theDistinctive acteristic of the fish

参考答案

: ________

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: Directions：
TlIis part is to test your ability toDo practical writing．You are required to write aNotice according to the following information in Chinese．Remember to write the Noticeon the Composition Sheet．
事由：春游
参加者：所有新生
活动内容：上午：参观植物园并看人与自然的展览
下午：中山陵
集合时间和地点：3月20日上午7：00；校大门前
注意事项：
1．自带午餐；
2．参加者在下周四前到学生会报名。
Words for reference：植物园theBotanical garden

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: ________

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: ________

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: ________

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: 根据下列材料回答下列各题。
Directions：Pick out the appropriate expressions from the eight choicesBelow and coin-plete the followingDialoguesByBlackening the corresponding letter on the Answer Sheet．
A．What about making it a little earlier?
B．I have no idea．
C．Let’s go together．
D．Thank you all the same．
E．Do you likeBasketball?
F．When and where shall we meet?
G．TtDoesnt matter?
H．What are you going toDo?
A：WhatDo you plan toDo this weekend?
B： ___56___
A：I hear there’s going toBe aBasketbaH match this Sunday．Tom and I are going to wgtch it． ___57___
B：Of course．Basketball is my favourite．But I have no ticket for the match．What a pity!A：You’re lucky．I have some free tickets． ___58___
B：Great ! ___59___
A：Let’S meet at theBus stop at half past five．
B：I think there mustBe aBig crowd of people there．____60___A：OK．See you at five oclock．
B：See you．
________

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: （　）The reason why the electric eel is able to give more powedul shock is that．

A.compared with those in the torped0，the working system of electric plates in theeel is moreDirect and efficient
B.compared with other electric fish，the eel possesses much more electricDlates
C.the working system of the electric plates in the eel is far inferior to those in thetorpedo
D.the working system of the electric plates in the eel is the most effective

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: （　）Usually you will not get a shockBy touching the electric ray in one place onlyBe．cause__________．

A.a torped0’s electric cells contain more than one electricDlates
B.to complete the circuit，you have to touch the fish in twoDlaces
C.the current in one place is not strong enough to give a shock
D.the fish’s electric cells are filled with jelly-like substance

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: （　）The main idea of the third paragraph is that．

A.the mass of the fishDecides the intensity of electric power it generates
B.the strength of shock givenBy a young electric ray can only light theBulb of apocket flashlight
C.to make full use of the energy producedBy electric fish，suitable wires shouldBeavailable
D.a mature torpedo is capable of producing enough electricity to knockDown a man

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: （　）WhyDoes the writer say“at the risk of inflation”?

A.Because he feels that he mightBe exaggerating
B.Because he has recently praised more works than usual
C.Because lie finds it hard toBe objective
D.Because he feels he may not praise the work sufficiently

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