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The Great Barrier Reef has seen its thir...

    The Great Barrier Reef has seen its third mass bleaching (大规模白化) event in five years. For the first time, all three sections of the Australian reef have been badly affected. The damage happened in February when the area was exposed to the hottest month of water temperatures on record.

Surveys conducted by Terry Hughes at James Cook University in Australia and his team during March made it known that 25 percent of the reef had been badly bleached and 35 percent bleached to some degree. The northern, central and southern sections of the reef were all hit.

Terrible bleaching also struck in 1998, 2002, 2016 and 2017, but was limited to one or two sections. This is the first time that all three sections have experienced terrible bleaching at exactly the same time, says Hughes. “It’s heartbreaking.”

Some of the damaged corals(珊瑚)will survive, including more heat-resistant(耐热的) species. But many others were probably “literally cooked” at the peak of the heatwave in early 2020, says Hughes. Others will die more slowly from stress over the next few months, he adds. Hughes has serious concern about the southern reef, which was mostly unaffected in former bleaching events and hasn’t developed the same heat resistance as other parts.

The 2016 and 2017 events killed about half the coral on the reef. It usually takes a decade for even fast-growing corals to recover, meaning the latest damage will seriously weaken the reef’s ability to recover, says Hughes. The high frequency of mass bleaching in recent years has been driven by climate change, which results from human activity and is steadily raising ocean temperatures. The only way to deal with the problem is to immediately reduce the release of greenhouse gases, says Hughes.

1.What can we learn from the surveys by Hughes and his team?

A.The entire reef has experienced bleaching.

B.The surveys about the reef are done once a year.

C.The hottest month of water temperatures is February.

D.60 percent of the reef suffered from serious bleaching.

2.Why is Hughes worried about the southern reef most?

A.Many corals will die slowly from stress.

B.It has been badly bleached for several years.

C.It hasn’t formed the ability to fight against the heat.

D.The government hasn’t shown any concern about it.

3.What is this text mainly about?

A.Surveys on reef bleaching.

B.A report on climate change.

C.An investigation into global warming.

D.Warning messages on human activities.

 

1.A 2.C 3.A 【解析】 这是一篇记叙文。文章讲述的是珊瑚礁白化调查。 1. 推理判断题。根据第二段中The northern, central and southern sections of the reef were all hit.“珊瑚礁的北部、中部和南部都受到了冲击。”和第三段中This is the first time that all three sections have experienced terrible bleaching at exactly the same time, says Hughes. “It’s heartbreaking.” 休斯说,这是第一次这三个部分同时经历可怕的漂白。“这是令人心碎的。”由此可知,我们能从休斯和他的团队的调查中了解到整个珊瑚礁都经历了白化。故选A。 2. 细节理解题。根据第四段中Hughes has serious concern about the southern reef, which was mostly unaffected in former bleaching events and hasn’t developed the same heat resistance as other parts. “休斯非常关心南部的珊瑚礁,因为在以前的白化事件中,南部的珊瑚礁几乎没有受到影响,而且没有像其他部分那样具有同样的耐热性。”由此可知,休斯之所以最担心南部暗礁,是因为它还没有形成对抗高温的能力。故选C。 3. 主旨大意题。根据第二段中Surveys conducted by Terry Hughes at James Cook University in Australia and his team during March made it known that 25 percent of the reef had been badly bleached and 35 percent bleached to some degree.“澳大利亚詹姆斯库克大学的特里·休斯和他的团队在3月份进行的调查表明,25%的珊瑚礁已经严重褪色,35%的珊瑚礁在一定程度上褪色。”由此可知,这篇文章讲述的是珊瑚礁白化调查。故选A。
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