二、 Reading Comprehension(35 minutes,40points)here are 4 passages in this part.Each passage is followed by 5 questions or unfinished statements.For each of them there are 4 choices marked A ,B, C and D.Choose the best one and mark your answer on the ANSWER SHEET with a single bar through the centre of the letter that indicates your choice.
　　根据以下材料，回答下面试题
　　Wisdom teeth are normally the last teeth to appear. This usually happens when people are in their late teen years or early twenties--in other words, when they are older and wiser.
　　Wisdom teeth are chewing teeth, at the back of the mouth. They can grow into place normally and never cause a problem. But often there is not enough room for them in the mouth. They might crowd other teeth. Sometimes they even push sideways through the gums(牙床).
　　An impacted wisdom tooth is one that fails to completely rise through the gum--the term is erupt. Wisdom teeth that only partially erupt can leave space for bacteria to enter around the tooth. Infection is a risk in these cases.
　　Wisdom teeth that are not well in place and become impacted are often removed. People should have the placement of their wisdom teeth examined between the ages of sixteen and twenty. X-rays can show wisdom teeth that are below the gums.
　　The American Dental Association says removal is generally advised when wisdom teeth only partly break through the gums. Removal is also advised if there is a chance that poorly placed wisdom teeth will damage other teeth. And removal is called for in cases where fluid collects around a wisdom tooth that is partly or fully below the gum.
　　But why do we have wisdom teeth if we often need to get them removed?One theory has to do with our diets. Scientists say the diet of prehistoric humans probably required more chewing teeth. Life was probably a little rougher on the teeth back then, too. So it was good to have extras.
　　The American Association of Oral and Maxillofacial ( 上颌面的 ) Surgeons says young adults are the best candidates for wisdom teeth removal. The group says older patients may be at greater risk for disease in the tissue surrounding the teeth.
　　After surgery, there can be swelling of the gums and face and some pain.Both can be treated with cold wraps and medication(药物治疗).
　　第11题 Wisdom teeth will cause problem when_____.
　　A.they are below the gums
　　B.they have erupted from the gums
　　C.they don't have place to grow normally
　　D.people are at their late teens or early twenties
　　第12题 The term "erupt" in this passage probably means_____.
　　A.a tooth suddenly appears B.a tooth rises through the gum
　　C.a wisdom tooth suddenly cause a problem D.a wisdom tooth fails to rise completely
　　第13题 When a wisdom tooth fails to rise completely,_____.
　　A.it may need more time to grow B.it may cause swelling in the face
　　C.it may cause infection D.it may be left unnoticed
　　第14题 Humans have wisdom teeth probably because
　　A.our ancestors needed to chew more when they grew up
　　B.our ancestors' teeth grew at late teens or early twenties
　　C.our ancestors ate foods without cooking
　　D.our ancestors had very tough lives
　　第15题 The problem wisdom teeth should be removed early, because
　　A.older patients will feel more pain
　　B.older patients may face more serious problems
　　C.wisdom teeth are easier to be removed at young age
　　D.young people have stronger resistance to diseases

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