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1、专题训练（三）AAlong the river banks of Amazon and the Orinoco there lives a bird that swims before it can fly, flies like a fat chicken, eats green leaves, has the stomach of a cow and has claw (爪)on its wings when young. They build their homes about 4.6m above the river, an important feature(特征)for the s
2、afety of the young. It is called the hoatzin.In appearance, the birds of both sexes look very much alike with brown on the back and cream and red on the underside. The head is small, with a large set of feathers on the top, bright red eyes, and blue skin. Its nearest relatives are the common birds,
3、cuckoos. Its most striking feature, though, is only found in the young.Baby hoatzins have a claw on the leading edge of each wing and another at the end of each wing tip. Using these four claws, together with the beak(喙), they can climb about in the bushes, looking very much like primitive birds mus
4、t have done. When the young hoatzins have learned to fly, they lose their claws.During the drier months between December and March hoatzins fly about the forest in groups of 20 to 30 birds, but in April, when the rainy season begins, they collect together in smaller living units of two to seven bird
5、s for producing purposes. （ ）1. What is the text mainly about? A. Hoatzins in dry and rainy season.B. The relatives and enemies of hoatzinsC. Primitive birds and hoatzins of the Amazon.D. The appearance and living habits of hoatzins（ ）2. Young hoatzins are different from their parents in that _. A.
6、they look like young cuckoosB. they have claws on the wingsC. they eat a lot like a cowD. they live on river banks （ ）3. What can we infer about primitive birds from the text? A. They had claws to help them climb.B. They could fly long distances C. They had four wings like hoatzinsD. They had a head
7、 with long feathers on the top （ ）4. Why do hoatzins collect together in smaller groups when the rainy season comes? A. To find more food.B. To protect themselves betterC. To keep themselves warmD. To produce their young.B The 2012 London Olympics had enough problems to worry about. But one more has
8、 just been added a communications blackout caused by solar storms. After a period of calm within the Sun, scientists have detected the signs of a flesh cycle of sunspots that could peak in 2012, just in time for the arrival of the Olympic torch in London. Now scientists believe that this peak could
9、result in vast solar explosions that could throw billions of tons of charged matter towards the Earth, causing strong solar storms that could jam the telecommunications satellites and interact links sending five Olympic broadcast from London . “The Suns activity has a strong influence on the Earth.
10、The Olympic could be in the middle of the next solar maximum which could affect the functions of communications satellites,”said Professor Richard Harrison ,head of space physics at the Rutherford Appleton Laboratory in Oxfordshire. At the peak of the cycle, violent outbursts called coronal mass eje
11、ctions(日冕物质抛射)occur in the Suns atmosphere, throwing out great quantities of electrically-charged matter.” A coronal mass ejection can carry a billion tons of solar material into space at over a million kilometers per hour. Such events can expose astronauts to a deadly amount, can disable satellites
12、, cause power failures on Earth and disturb communications, ” Professor Harrison added. The risk is greatest during a solar maximum when there is the greatest number of sunspots.Next week in America, NASA is scheduled to launch a satellite for monitoring solar activity called the Solar Dynamics Obse
13、rvatory(SDO), which will take images of the Sun that 10 time clearer than the most advanced televisions available.The Rutherford Appleton Laboratory helped to make the high tech cameras that will capture images of the solar flares(太阳耀斑)and explosions as they occur.Professor Harrison Hold away, the l
14、abs director said that the SDO should be able to provide early warning of a solar flare or explosion big enough to affect satellite communications on Earth “If we have advance warning, well be able to reduce the damage. What you dont want is things switching off for a week with no idea of whats caus
15、ed the problem, ” he said.（ ）1. The phrase” communications blackout” in paragraph 1 most probably refers to _ during the 2012 Olympics.A. the extinguishing of the Olympic torchB. the collapse of broadcasting systemsC. the transportation breakdown in LondonD. the destruction of weather satellites（ ）2
16、. What can be inferred about the solar activity described in the passage？ A. The most fatal matter from the corona falls onto Earth.B. The solar storm peak occurs in the middle of each cycle.C. It takes several seconds for the charged matter to reach Earth.D. The number of sunspots declines after coronal mass ejections.（ ）3. According to the p
