阅读下列短文，从每题所给的四个选项中，选出最佳选项。

　　When they look at the sky, people usually find the sky looks blue－ not orange, red, green or yellow．Do you know why?

　　It gets its blue colour from the sunlight that shines through the air．Sunlight contains all the colours, which the rainbow is made up of, but these coulours are scattered as they pass through the air．Some coulours are scattered more than others, and the colour that is scattered the most is the colour you see – blue．

　　The sky usually looks light blue．But it would be deep, dark blue if you stood on top of the highest mountain, where there is less air between you and the sun to scatter the sunlight, the sky would be so dark that it would be black．

　　Sometimes the sky doesn't look blue．At sunrise and sunset, the light from the sun sometimes scattered in such a way that you see red, orange, and other colours in the sky．

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阅读理解

　　On a hill 600 feet above the surrounding land, we watch the lines of rain move across the scene, the moon rise over the hills, and the stars appear in the sky．The views invite a long look from a comfortable chair in front of the wooden house．

　　Every window in our wooden house has a view, and the forest and lakes seldom look the same as the hour before．Each look reminds us where we are．

　　There is space for our three boys to play outside, to shoot arrows, collect tree seeds, build earth houses and climb trees．

　　Our kids have learned the names of the trees, and with the names have come familiarity and appreciation．As they tell all who show even a passing interest, maple(枫树)makes the best fighting sticks and white pines are the best climbing trees．

　　The air is clean and fresh．The water from the well has a pleasant taste, and it is perhaps the healthiest water our kids will ever drink．Though they have one glass a day of juice and the rest is water, they never say anything against that．

　　The seasons change just outside the door．We watch the maples turn every shade of yellow and red in the fall and note the poplars'(杨树)putting out the first green leaves of spring．The rainbow smelt fills the local steam as the ice gradually disappears, and the wood frogs start to sing in pools after being frozen for the winter．A family of birds rules our skies and flies over the lake．

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阅读理解

　　The Australian continent is a land like no other．Its animals, plants and landscapes have evolved(演化)over one thousand years, and there are about a million different natural species(物种)in Australia．More than 80 per cent of the country's plants and animals are unique to Australia, along with most of the fish and almost half the birds．

　　Australia has more than 140 species of marsupials(有袋动物)，including koalas, wombats and the Tasmanian devil, now found only in the Australian wilderness．More than 750 species of birds have been recorded in Australia, 350 of which are found nowhere else in the world．Among them are the kookaburra, the rainbow lorikeet and fairy penguins．There are also 55 differernt species of macropods－the kangaroo family－native to Australia．They vary greatly in size and weight, ranging from half a kilogram to 90 kilograms．

　　The country has been making every effort to protect its natural heritage．Despite the large size of the continent, the majority of Australians live on the coast and in major cities－around 75 per cent of Australia's population lives in city areas．

　　Australia is the driest continent on earth．Its center has one of the lowest rainfalls in the world and about three-quarters of the land is dry．These dry areas extend from the large central deserts to the western coast．Soils in these areas are very poor compared to other deserts．This has given Australians a great challenge．They have to make the best use of the variety of regions to meet the competing demands of agriculture, economy and conservation．

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