It is believed that _____ European scientist invented _______.      A.an; a tele

It is believed that _____ European scientist invented _______.      A.an; a tele

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It is believed that _____ European scientist invented _______.      
A.an; a televisionB.a; a televisionC.an; the televisionD.a; the television

答案
D
解析

举一反三

I don"t think the experiment is _____ failure. At least we have got _____ experience for our
future work on _____ nature. 
A./; /; /B.a; /; theC.a; /; /D./; the; /

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In that south American country, _____bicycle is not_______ popular means of transportation.
A.the;aB.a;不填C.a:theD.the;the

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Never lose _____ heart. There is always a chance of _____ weak defeating _____ strong.
A.×; the; theB.the; the; theC.×; ×; ×D.a ; the; the

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After winning      war in Iraq,the country fell into     new worries of economy.
A.the; theB.a; theC.the; /D.a; /

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While other scientists are keeping____eye on changes in the H5N1 bird flu strain, the scientists in England are working on vaccines, in case it becomes highly infectious in ____humans.
A.a , /B.an, /C.the, anD.an, the

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