Polarbearsaresufferingina  61  (warm)worldthaneverbefor...

問題詳情：

Polar bears are suffering in a   61   (warm) world than ever before.

Polar bears live in environments too cold for most animals.   62      much of the year, they live and hunt on the frozen Arctic sea ice. Nature has prepared   63     for the cold conditions. But nothing has prepared the bears for the danger that   64     (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   65     1978. Now about 20,000 to 25,000 polar bears live in the Arctic. Polar bears depend on the sea ice for their   66     (survive). “The sea ice is more than just this platform that the bears walk over,” says Andrew Derocher,   67     scientist who studies North American polar bear populations. “    68    it, they can’t exist.”

Some melting and refreezing of the polar ice is natural.     69     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,      70    the bears are not actively hunting.

【回答】

61. warmer   句中出現than，要用比較級。

62. During  during much of the year 在一年的大多數時候

63. them   講的是Polar bears ，這裡需要用賓格them。

64. threatens  that引導的定語從句，缺少謂語，要用threat的動詞threaten, 主語是danger，要用threatens。 

65. since   since+點時間，用現在完成時。

66. survival  their修飾名詞。

67. a  單數名詞前，表泛指，用a。

68. Without 沒有*，他們無法生存。

69. But   一些極地*的融化和重新凍結是很自然的，但是在一個更暖和的世界,這些週期加快了。

70. when當熊不積極打獵時，這些額外的脂肪就會被用掉。

知識點：短文填空

題型：閱讀填空