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Up to now, our society ________ with limited living space and a shortage of natural resources.

A．has been challenged	B．is being challenged
C．is challenging	D．has challenged

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相关试题

_______ more to be pitied than blamed．

A．Uneducated are	B．Uneducated is
C．The uneducated are	D．The uneducated is

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Earth is believed ______ by an object the size of Mars at some point in the distant past
before its surface cooled．

A．to be hit

B．to have hit

C．to have been hit

D．to hit

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With temperature ______ so rapidly, we could not go with the experiment．

A．fall

B．falling

C．fallen

D．to fall

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--- Is John in the office?
---I didn’t see ______ there．

A．anyone

B．someone

C．everyone

D．each one

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Because of ______high demand for Type AB blood，____supplies of it are usually limited．

A．the；the

B．不填；不填

C．不填；the

D．a；the

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