Polar bears are suffering in a 35.  (warm) world than ever before.

Polar bears live in the environment too cold for

most animals. 36.     much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared 37.   (they) for the cold conditions.

But nothing has prepared the bears for the danger that 38.   (threat) the only home they know.

The polar bears' world is melting. Studies show-that the polar ice has reduced by 9. 8% every 10 years 39.   1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their 40.      (survive).  "The sea ice is more than just this platform that the bears walk over," says Andrew Derocher, 41.    scientist who studies   North   American   polar   bear populations. "42.   it, they can't exist."

Some melting and refreezing of the polar ice is natural. 43.    in a warmer world, these cycles speed up, and bears have less time to hunt. Normally,they have three months in the spring when they gain more weight. The extra fat is used later, 44.       the bears are not actively hunting.

35.   warmer   36.   For/During   37.   them   38.   has threaten 39.  since   40.  survival   41.  a   42.  Without   43. But 44. when

題目來(lái)源：加加練高考英語(yǔ)小題綜合加大題滾動(dòng)新課標(biāo)全國(guó)卷地區(qū)專用 > 訓(xùn)練29 閱讀理解（科普知識(shí)型）+完形填空（夾敘夾議文）+語(yǔ)法填空

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閱讀理解

A

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