Unit 4 Astronomy- the science of the stars课时作业

language points

　　第一节　(共15小题；每小题2分，满分30分)

　　阅读下列短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　A

　　(2018·山东师大附中高三模拟考试)

　　Soon enough，we will lose some of the most amazing sites on Earth!

　　The Great Barrier Reef

　　Rising air temperatures will cause sea temperatures to rise as well.All life supported by the oceans will be affected with this shock to their ecosystem.Coral are some of the most vulnerable marine animals and we are already watching whole reefs disappear.The Great Barrier Reef in Australia is no exception and will continue to shrink as the temperatures rise！These reefs are some of the best in the world for diving，but they will soon disappear!

　　Venice

　　Sprawing across(横跨)hundreds of small islands in Northeast Italy，Venice is at extreme risk of sinking into the Adriatic Sea.Rising sea levels are in fact a serious threat to many coastal cities located at sea level.Lucky for us，however，Venice is developing a series of sea walls to protect the city in times of high tide.

　　Glacier(冰川)National Park

　　Glacier National Park was once covered by over 150 glaciers，but by 2005 it only had about 27！Located in Montana，Canada，this park is over a million acres and has a huge plant and wildlife population.As temperatures rise，the glaciers and ice melt，which will upset the ecosystems sustaining over a thousand plant species and hundreds of animals.

　　The Amazon

　　The cause behind the disappearance of these fantastic places ultimately comes down to humans.Our expansion usually requires cutting down forests for land，fuel and materials，but rarely considers the consequences.These forests are sources of food and medicine for just about everyone on the planet!

　　What will happen if we lose these valuable places and beautiful destinations？！

　　1．According to the text，what is causing coral's death?

　　A．Rising sea levels.

　　B．Humans' diving activities.

　　C．Rising sea temperatures.

　　D．The shrinkage(缩小)of their habitats.

　　2．What can we infer from the part of "Venice"？

　　A．Venice is the only coastal city of Italy.

　　B．Many places are in the risk of sinking below the sea level.

　　C．Venice will never sink because of the protection of sea walls.

　　D．Italy consists of hundreds of small islands in the Adriatic Sea.

　　3．What can we learn about Glacier National Park from the text?

　　A．It covers a large area in Montana.

　　B．It is covered by over 150 glaciers.

　　C．Plant species and animals in it have died out.

　　D．It doesn't support any living thing for its cold.

4．Which site's shrinking reason differs from the other sites?