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He promised ________ his old friend during his stay in Tianjin.

A. see B. seeing

C. saw D. to see

D 【解析】試題分析：promise to do sth：許諾做某事。故選D

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Elephants losing tusks

People killing elephants for their tusks has long been a problem worldwide. Although laws have been introduced to ban the selling of tusks, they have not been enough to save the elephants.

But the giant animals have now “developed” their own solution to stay safe from hunters----by not growing tusks at all.

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A. Elephants learned to lift and dig things up without tusks.

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B. People should pay lower prices for products made with elephant tusks.

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D. The key to elephant protection is stopping the trade in tusk products.

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