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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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. A nature reserve for white-flag dolphins was set up in 1992, _______ boats have been
prohibited from sailing around since then.

A．where

B．which

C．when

D．what

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It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.

A．worked

B．had worked

C．has worked

D．working

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. —Has the conference about building a water-power plant come to an end?
—No, it’s _______. Experts just disagree on some issues.

A．under discussion

B．under control

C．under consideration

D．under way

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—Mike, do you want Kobe Bryant shoes or James shoes?
—Daddy, _______ I choose? I like both pairs.

A．shall

B．must

C．can

D．may

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. Students are often reminded that chances _______ to the well-prepared.

A．belong	B．are belonged
C．are belonging	D．will be belonged

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