Whencomestoresearchintoheartdi

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When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.

A．that

B．it

C．this

D．what

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To their great relief, the missing child returned home, ______, after an absence of two weeks.

A．felt tired and sound	B．tiring and soundly
C．feeling tired but soundly	D．tired but sound

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Have your working conditions improved?
---No, ______than before, I’m afraid.

A．no better

B．a little batter

C．not worse

D．no worse

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The task is too much for me, so I can’t carry on ______any longer. I must get some help.

A．singly

B．simply

C．alone

D．lonely

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I haven’t seen______ this since I collected stamps.

A．as old a stamp as	B．so an old stamp as
C．stamp as old as	D．as an old stamp a

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—— What do you think of the concert?—— Oh, it was______success.

A．a very

B．quite a

C．so

D．really

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