David is a friend you can trust all your life．( )A．whoB．whichC．whoseD．when 题目和参考答案——青夏教育精英家教网—

4．Dolphins have been declared the world's second most intelligent creatures after humans，with scientists suggesting they are so bright that they should be treated as"non-human persons"．
Studies into dolphin behavior have highlighted how similar their communications are to those of humans and that they are brighter than chimpanzees．These have been backed up by anatomical （解剖学） research showing that dolphin brains have many key features associated with high intelligence．Recently，a series of behavioral studies has suggested that dolphins，especially species such as the bottlenose，whose brains weigh about 5lb，could even be brighter than chimps，which some studies have found can reach the intelligence levels of three-year-old children．The studies show how dolphins have distinct personalities，a strong sense of self and can think about the future．
It has also become clear that dolphins are"culture"animals，meaning that new types of behavior can quickly be picked up by one dolphin from another．In one study，Diana Reiss，professor of psychology at Hunter College，City University of New York，showed that bottlenose dolphins could recognize themselves in a mirror and use it to inspect various parts of their bodies，an ability that had been thought limited to humans and great apes．In another，she found that they also had the ability to learn an elementary symbol-based language．
Other research has shown dolphins can solve difficult problems，while those living in the wild cooperate in ways that imply complex social structures and a high level of emotions．In one recent case，a dolphin rescued from the wild was taught to tail-walk for three weeks in a dolphinarium （海豚宫） in Australia．After she was released，scientists were astonished to see the trick spreading among wild dolphins who had learnt it from the former captive （被俘的）．Such observations have prompted questions about the brain structures of dolphins．
Researchers have found that brain size varies hugely from around 7oz for the small species to more than 19lb for the sperm whales，whose brains are the largest on the planet．Human brains，by contrast，range from 21lb-4lb．When it comes to intelligence，however，brain size is less important than its size relative to the body．
oz：an ounce in weight （1oz=28g）
lb：a pound in weight （1lb=454g=16oz）

（Note：Answer the questions or complete the statements in no more than twelve words．）
78．The which in the 2nd paragraph refers tochimps．
79．What do bottlenose dolphins do to make Diana Reiss believe they are"culture"animalsInspecting various parts of their bodies and learning an elementary symbol-based language．
Inspecting their bodies and learning a symbol-based language．？
80．The spreading of tail-walk shows wild dolphins havecomplex social structures and a high level of emotions．．
81．What is the main factor that decides the level of intelligence according to the last paragraphThe brain size relative to the body．？

1．The fact that many people are still suffering from Ebola makes us think when the problemwill be settled．（settle）
许多人依旧在遭受坦博拉病情的折磨的这个事实不禁让我们想到这个问题何时将得到解决．

8．Banderi's music is popular with teenagers，and his latest one iswell worth listening to（worth）．
班得瑞的音乐受到青少年的喜爱，他最近的一个很值得一听．

18．Only if you ask many different questionscan/will you acquire all the information you need to know．（acquire）
只有提很多不同的问题，你才能收集到你所需要的信息．

5．Have you ever considered how weak humans arecompared with/to a volcano，hurricane or earthquake？（compare）
你是否想过与火山、飓风或地震相比，人类是何等脆弱？

2．The more often you find opportunities to talk to the natives，themoreconfident you will feel when speaking a foreign language．（confident）
你找到跟以外语为母语的人说话的机会越多．说这门外语时你就会觉得越自信．

3．There's no doubt_____________international cooperation is the key to __________with cybercrime．（　　）

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