题目
Scientists often compare coral reefs（珊瑚礁）to underwater rainforests，yet unlike the leafy plant base of a forest，corals are animals.The soft creatures are naturally half-transparent and get their brilliant color from algae（藻类）living inside them.When corals experience stress from hot temperatures or pollution，they halt the interdependent relationship with algae，typically pushing them out and turning white.Corals are still alive when they are white，but they're at risk and many eventually die，turning dark brown. Scientists around the world are looking for means to protect and maybe increase corals.One common option is to create more protected areas — essentially national parks in the ocean.Beyond nature preserves，some conservationists are looking to more hands-on methods.One research center in the Florida Keys is exploring a form of natural selection to keep corals remaining.The reef system in the Keys has been hit hard by climate change and pollution，which is especially tough，because corals there help support fisheries worth ＄100 million every year. To keep the wild ecosystem alive，Erinn Muller，the center's director，and her team are harvesting samples of the corals that survived the environmental stress naturally，keeping them to make them reproduce，and then reattaching them to the reef.They have 46，000 corals on plastic frames under the sea.So far，the center has regrown over 70，000 corals from five different species on damaged reefs. In The Bahamas，Ross Cunning，a research biologist at Chicago's Shedd Aquarium，focuses on corals with genes that could make them natural candidates for restoration projects.He published a study of two Bahamian reefs，one that survived an extreme 2015 heat wave，and one that didn't. "We think their ability to deal with these higher temperatures is built into their genes，" says Cunning.There's evidence of corals evolving more quickly to resist rapidly warming climate.The big question scientists need investigate，adds Cunning，is how much more heat corals can adapt to.（1）What does the underlined word "halt" in the first paragraph mean？ ____ A.End.B.Develop.C.Strengthen.D.Weaken.（2）What do Muller and her team do to save corals？ ____ A.Restore the damaged reefs.B.Grow corals by hand underwater.C.reate more protected areas.D.Move corals to unpolluted areas.（3）What do Cunning's words suggest？ ____ A.Many corals have been genetically improved.B.Cooling down the waters is key to rescuing corals.C.Reasons for corals surviving heat waves are shocking.D.The highest temperature corals can survive is unclear.（4）Which can be a suitable title for the text？ ____ A.Relationship between corals and algaeB.Efforts made to save coralsC.Impact of climate warming on coralsD.Survival crisis faced by coral reefs
Scientists often compare coral reefs（珊瑚礁）to underwater rainforests，yet unlike the leafy plant base of a forest，corals are animals.The soft creatures are naturally half-transparent and get their brilliant color from algae（藻类）living inside them.When corals experience stress from hot temperatures or pollution，they halt the interdependent relationship with algae，typically pushing them out and turning white.Corals are still alive when they are white，but they're at risk and many eventually die，turning dark brown.
Scientists around the world are looking for means to protect and maybe increase corals.One common option is to create more protected areas — essentially national parks in the ocean.Beyond nature preserves，some conservationists are looking to more hands-on methods.One research center in the Florida Keys is exploring a form of natural selection to keep corals remaining.The reef system in the Keys has been hit hard by climate change and pollution，which is especially tough，because corals there help support fisheries worth ＄100 million every year.
To keep the wild ecosystem alive，Erinn Muller，the center's director，and her team are harvesting samples of the corals that survived the environmental stress naturally，keeping them to make them reproduce，and then reattaching them to the reef.They have 46，000 corals on plastic frames under the sea.So far，the center has regrown over 70，000 corals from five different species on damaged reefs.
In The Bahamas，Ross Cunning，a research biologist at Chicago's Shedd Aquarium，focuses on corals with genes that could make them natural candidates for restoration projects.He published a study of two Bahamian reefs，one that survived an extreme 2015 heat wave，and one that didn't. "We think their ability to deal with these higher temperatures is built into their genes，" says Cunning.There's evidence of corals evolving more quickly to resist rapidly warming climate.The big question scientists need investigate，adds Cunning，is how much more heat corals can adapt to.
（1）What does the underlined word "halt" in the first paragraph mean？ ____
A.End.
B.Develop.
C.Strengthen.
D.Weaken.
（2）What do Muller and her team do to save corals？ ____
A.Restore the damaged reefs.
B.Grow corals by hand underwater.
C.reate more protected areas.
D.Move corals to unpolluted areas.
（3）What do Cunning's words suggest？ ____
A.Many corals have been genetically improved.
B.Cooling down the waters is key to rescuing corals.
C.Reasons for corals surviving heat waves are shocking.
D.The highest temperature corals can survive is unclear.
（4）Which can be a suitable title for the text？ ____
A.Relationship between corals and algae
B.Efforts made to save corals
C.Impact of climate warming on corals
D.Survival crisis faced by coral reefs
Scientists around the world are looking for means to protect and maybe increase corals.One common option is to create more protected areas — essentially national parks in the ocean.Beyond nature preserves，some conservationists are looking to more hands-on methods.One research center in the Florida Keys is exploring a form of natural selection to keep corals remaining.The reef system in the Keys has been hit hard by climate change and pollution，which is especially tough，because corals there help support fisheries worth ＄100 million every year.
To keep the wild ecosystem alive，Erinn Muller，the center's director，and her team are harvesting samples of the corals that survived the environmental stress naturally，keeping them to make them reproduce，and then reattaching them to the reef.They have 46，000 corals on plastic frames under the sea.So far，the center has regrown over 70，000 corals from five different species on damaged reefs.
In The Bahamas，Ross Cunning，a research biologist at Chicago's Shedd Aquarium，focuses on corals with genes that could make them natural candidates for restoration projects.He published a study of two Bahamian reefs，one that survived an extreme 2015 heat wave，and one that didn't. "We think their ability to deal with these higher temperatures is built into their genes，" says Cunning.There's evidence of corals evolving more quickly to resist rapidly warming climate.The big question scientists need investigate，adds Cunning，is how much more heat corals can adapt to.
（1）What does the underlined word "halt" in the first paragraph mean？ ____
A.End.
B.Develop.
C.Strengthen.
D.Weaken.
（2）What do Muller and her team do to save corals？ ____
A.Restore the damaged reefs.
B.Grow corals by hand underwater.
C.reate more protected areas.
D.Move corals to unpolluted areas.
（3）What do Cunning's words suggest？ ____
A.Many corals have been genetically improved.
B.Cooling down the waters is key to rescuing corals.
C.Reasons for corals surviving heat waves are shocking.
D.The highest temperature corals can survive is unclear.
（4）Which can be a suitable title for the text？ ____
A.Relationship between corals and algae
B.Efforts made to save corals
C.Impact of climate warming on corals
D.Survival crisis faced by coral reefs
题目解答
答案
（1）A.词义猜测题。根据画线词上文的The soft creatures are naturally half-transparent and get their brilliant color from algae （藻类） living inside them.和下文的 the interdependent relationship with algae，typically pushing them out and turning white. （珊瑚虫因生活在它体内的藻类获得了绚丽的色彩，它们相互依赖，当珊瑚虫受到高温或污染的压力时，它们通常会将藻类驱逐出去，变成白色。）故此处应表示"它们结束与藻类的相互依存的关系"。因此画线词意思为"结束，停止"。结合选项A.End结束，停止；B.Develop发展；C.Strengthen加强；D.Weaken减弱。故选A。
（2）B .细节理解题。根据第三段的" harvesting samples of the corals that survived the environmental stress naturally，keeping them to make them reproduce，and then reattaching them to the reef.They have 46，000 corals on plastic frames under the sea.So far，the center has regrown over 70，000 corals from five different species on damaged reefs." Muller和她的团队正在采集那些在自然环境压力下存活下来的珊瑚虫样本，在海底人工养殖它们，然后使它们重新回到珊瑚礁上生存。由此可知，Muller和她的团队在人工培育珊瑚虫。故选B。
（3）D .推理判断题。根据题干中的Cunning's words可将解题依据定位至最后一段，根据最后一段的The big question scientists need to investigate，adds Gunning，is how much more heat corals can adapt to.Gunning补充说，科学家需要调查的一个大问题是珊瑚还能适应多少热环境。可知，科学家还需要研究存活下来的珊瑚虫还能适应再高多少的温度，即珊瑚虫能适应的最高温度还是未知的。故选D。
（4）B .标题归纳题。综合全文可知，文章首段介绍珊瑚礁面临的困境，以引出文章的核心内容：科学家们为了拯救珊瑚礁进行各种科学研究和做出种种努力，如建立海洋保护区、人工培育珊瑚虫、研究具有耐高温基因的珊瑚虫等。故B项最适合作本文标题。故选B。
（2）B .细节理解题。根据第三段的" harvesting samples of the corals that survived the environmental stress naturally，keeping them to make them reproduce，and then reattaching them to the reef.They have 46，000 corals on plastic frames under the sea.So far，the center has regrown over 70，000 corals from five different species on damaged reefs." Muller和她的团队正在采集那些在自然环境压力下存活下来的珊瑚虫样本，在海底人工养殖它们，然后使它们重新回到珊瑚礁上生存。由此可知，Muller和她的团队在人工培育珊瑚虫。故选B。
（3）D .推理判断题。根据题干中的Cunning's words可将解题依据定位至最后一段，根据最后一段的The big question scientists need to investigate，adds Gunning，is how much more heat corals can adapt to.Gunning补充说，科学家需要调查的一个大问题是珊瑚还能适应多少热环境。可知，科学家还需要研究存活下来的珊瑚虫还能适应再高多少的温度，即珊瑚虫能适应的最高温度还是未知的。故选D。
（4）B .标题归纳题。综合全文可知，文章首段介绍珊瑚礁面临的困境，以引出文章的核心内容：科学家们为了拯救珊瑚礁进行各种科学研究和做出种种努力，如建立海洋保护区、人工培育珊瑚虫、研究具有耐高温基因的珊瑚虫等。故B项最适合作本文标题。故选B。