Question

 Rising temperatures, rising sea levels and other trends are having an effect on the world's sea turtles. All female turtles come ashore at nesting beaches, dig nests in the sand,lay their eggs and then return to the sea. Erosion of nesting beaches caused by rising sea level and more intense storms adds the potential for further dangers to nesting beaches where people，dogs and rats already prey on the eggs of marine turtles.

  Climate change directly affects the reproduction of sea turtles in three ways. First, sea level rise will affect significant nesting beach areas on low-level sand beaches such as Bonaire, the Maldives and the Great Barrier Reef. Second, rising temperatures increase the chance that sand temperature will exceed the upper limit for egg incubation(姅化) ，which is 34t. Third,rising temperatures bias(使偏向) the sex ratio toward females because temperature during incubation determines the sex of the egg. Loggerhead turtle nests in Florida are already producing 90 per?cent females owing to high temperatures，and if warming raises temperatures by an additional

or more,no males will be produced there.

  Adult feeding patterns are also affected by climate change. Sea grass beds are in decline, water temperature is higher on inter-tidal sea grass fiats, and coral reefs, typically feeding grounds for green turtles, are affected by bleaching(漂白) .

  Sea turtles have existed for more than 100 million years and have survived ice ages. As a result, they may be able to respond to unfavorable nesting temperatures, by seeking out new nesting sites. It may however take decades or centuries for sea turtles to re-establish and stabilize their habitats，and steady human development of coastal areas makes the availability of new hab?itat for them very limited.

(   ) 1. What will happen if sand temperature is higher than 34^3?

    A. More females will be born.   B. Turtle eggs will not hatch.

   C. Females will lay fewer eggs.   D. Newly-born turtles will die.

(   ) 2. In what way does climate change affect adult turtles?

    A. They can't find enough food.   B. They have lost their habitat.

   C. Their feeding patterns are affected.   D. Their living habits are changed. 

(   ) 3. What can we learn about Loggerhead turtle nests in Florida?

    A. They already have an imbalanced sex ratio.

    B.They can hardly survive the high temperature.

   C.No more males are produced now.

   D.Most of them die young.

(   ) 4. We can infer from the last paragraph that______ .

   A.human development constantly threaten the survival the of sea turtles

   B.climate change can't threaten the survival of sea turtles

   C.sea turtles can get used to cold climate

   D.it's easy for sea turtles to find new habitat

Answer 1

1—4 BCAA 

本文是說明文。氣候變暖會導(dǎo)致海平面上升、氣溫升高，這一切都威脅著海龜?shù)纳�存�?. B從文章第二段可知，海龜孵化的極限溫度是34度，超過這個溫度孵化就會失敗。

2.C從文章第三段可知，氣候變化影響了成年海龜?shù)囊捠衬Ｊ健?/p>

3.A從文章第二段可知，溫度升高，紅海龜孵化的小海龜性別比例嚴(yán)重失衡。

4.A文章最后一段說明，海龜對氣溫變化適應(yīng)能力很強(qiáng)，但人類的海岸開發(fā)對海龜是個很大的威脅。

B美國國家公園實(shí)際上是自然保護(hù)區(qū)。自美國黃石國家公園設(shè)立以來，全世界已有一百多個國家設(shè)立了多達(dá)1 ，200處風(fēng)情各異、規(guī)模不等的國家公園。