題型五還原句子AImagine you have a history or math test in school.1._B_ How should you prepare for this terrible event?Should you reread your history，math or English books? What about underlining important words or sentences? 2._C_ But are these truly the best methods?Mary Pym，an American scientist，says that both rereading and underlining are ineffective(無效的) study tools，but better than not studying at all.She believes they are not as useful as other habits. When you reread something，you are not trying to actively receive the information.It seems that you already know the information because youve already read it.The problem with underlining is that you dont always know what the most important information is.3._D_ What should you do if rereading and underlining are not the best ways to study for a test? 4._A_ Simple cards and practice exams can help when you want to make sure that you have learned something.No matter what methods you choose，you should know that effective learning takes time and effort.AOne idea is to test yourself.BEven worse，you could have an English test.CThese methods are monly used in schools around the world.DSo its possible that you are underlining something not so important.BThe undersea world is very beautiful.Now more and more people want to dive in the water to find the secret there.Scuba diving(水肺潛水) is a new sport today.1._B_You will find many strange animals in the sea.2._A_ Many sea animals give out light in the dark and some have sharp teeth.During the day，there is enough light.Here，under the sea，everything is blue and green.When fish swim nearby，you can catch them with your hands.When you have bottles of air on your back，you can stay in deep water for a long time.3._D_ And you must be very careful when you dive in deep water.The deep sea is not an easy place to live in.Its cold，and its dark，too.The deeper it is，the less sunlight there is.About 3，000 feet，there is no light at all.It is very dark in the sea.Many fish have no eyes.Some have big eyes.A few have eyes on one side.4_C_ Animals eat！They must find food to eat.Many animals eat plants.However，some animals eat meat.This means these sea animals have two big jobs.They need to find animals as food，and they have to try not to bee other animals meal.ASome are as large as a school bus.BIt can take you into a wonderful undersea world.CBesides the cold and darkness，deepsea animals face a third dangerother animals.DHowever，you cant dive too deep.CIn Australia there is a famous island called Fraser Island.A great many visitors e here for holidays every year.Why? The reason is that it is special.1._D_ In fact，it is the largest sand island in the world.Its about 200 kilometers long and 240 kilometers wide.Though the island is a popular place of interest，there is no airport on the island.The long beach along the east coast works as the airport.2._A_On the island there are sand hills without any plants，but there are forests with old trees，beautiful flowers and over a hundred lakes，too.3._B_Every year，visitors e to enjoy the islands natural beauty.People like camping and hiking there.4._C_ Animals were killed for food and this made them in danger of extinction(滅絕)They threw rubbish everywhere，and the lakes were seriously polluted.So it is time to protect the environment of the island.Rules have been set up.For example，visitors are not allowed to use motorboats(摩托艇) or go fishing in the lakes，and they mustnt leave any rubbish.APlanes arrive and leave from here.BThe island is pletely made of sand.CUnluckily，visitors have caused many problems.DMany kinds of birds and animals live in the forest.