The time and effort he has devoted during the past few years trees in that village are now considered to be very important．( )A．to plantingB．to plantC．plantD．planting 题目和参考答案——青夏教育精英家教网—

6．On the morning of October 12，1492，Christopher Columbus and his crew came to the shores of the Caribbean islands，mistakenly believing they ________ in Southeast Asia．（　　）

A．

arrived

B．

13．I insisted that he ____，which means I insisted on ____．（　　）

	A．	should go； he goes		B．	go； he goes
	C．	should go； him going		D．	would go； his going

3．It's not easy for a Chinese person to speak English sofluently （流利地）．

10．His play was based on what he had learned from his teachers．

9．Winter begins in the north on December 22nd．People and animals have been doing what they always do to prepare for the colder months．Squirrels （松鼠），for example，have been busy gathering nuts from trees．Well，scientists have been busy gathering information about what the squirrels do with the food they collect．
They examined differences between red squirrels and gray squirrels in the American state of Indiana．The scientists wanted to know how these differences could affect the growth of black walnut （黑胡桃） trees．The black walnut is the nut of choice for both kinds of squirrels．The black walnut tree is also a central part of some hardwood forests．
Rob Swihart of Purdue University did the study with Jake Goheen，a former Purdue student now at the University of New Mexico．The two researchers estimate that several times as many walnuts grow when gathered by gray squirrels as compared to red squirrels．Gray squirrels and red squirrels do not store nuts and seeds in the same way．Gray squirrels bury nuts one at a time in a number of places．But they seldom remember where they buried every nut．So some nuts remain in the ground．Conditions are right for them to develop and grow the following spring．Red squirrels，however，store large groups of nuts above ground．Professor Swihart calls"death traps for seeds"．
Gray squirrels are native to Indiana．But Professor Swihart says their numbers began to decrease as more forests were cut for agriculture．Red squirrels began to spread through the state during the past century．
The researchers say red squirrels are native to forests that stay green all year，unlike walnut trees．They say the cleaning of forest land for agriculture has helped red squirrels invade Indiana．Jake Goheen calls them a sign of an environmental problem more than a cause．

68．The study done by Rob Swihart and Jake Goheen is toB．
A．find out the living conditions for squirrels
B．learn squirrels'influence on black walnut trees
C．do something to get rid of squirrels
D．save the forests in the American state of Indiana
69．The difference between gray squirrels and red squirrels mainly lies inD．
A．the way they gather the walnut
B．the time they have winter sleep
C．the place they have winter sleep
D．the place they store the walnuts
70．When Professor Swihart says"death traps for seeds"，he actually means thatC．
A．red squirrels eat more nuts than gray squirrels
B．gray squirrels and red squirrels will have severe fights
C．nuts above the ground will not develop into plants
D．seeds can be traps for other animals in the forest
71．According to the passage，which of the following is true？A
A．The black walnut is equally attractive to both gray and red squirrels．
B．Gray squirrels do more harm to the forest than red squirrels．
C．Red squirrels and gray squirrels have helped the spread of walnut trees．
D．The cleaning of forest land benefits red squirrels directly．

10．Advice to"sleep on it"could be well founded，scientists say．After a good night's sleep a problem that couldn't be solved the night before can often appear more manageable，although the evidence（证据）until now has been personal experience．But researchers at the University of Luebek in Germany have designed an experiment that shows a good night's sleep can improve insight（洞察力）and problem-solving．
"If you have some newly-got memories in your brain，sleep acts on these memories and rebuild them，so that after sleep the insight into problem which you could not solve before increases，"said Dr Jan Born，a neuroscientist（神经病学专家）at the university．To test the theory，they taught volunteers two simple rules to help them turn some numbers into a new order．There was also a third，hidden rule，which could help them increase their speed in solving the problem．The researchers divided the volunteers into two groups：half were allowed to sleep after the training while the rest were forced to stay awake．Dr Jan Born and his team noticed that the group that had slept after the training were twice as likely to figure out the third rule as the other group．"Sleep helped，"Born said in a telephone interview．"The important thing is that you have to have a memory representation in your brain of the problem you want to solve and then you sleep，so it can act on the problem．"But Born admitted that he and his team don't know how rebuilding of memories occurs or what governs it．Pierre Maquet and Perrine Ruby of the University of Liege in Belgium said the experimental evidence supports the suggestions that sleep can help develop creative thinking．Although the role of sleep in human creativity will still be a mystery，the research gives people good reason to fully respect their periods of sleep，they added．

60．The underlined phrase"sleep on it"in Paragraph 1probably meansA．
A．to delay deciding something until the next day
B．to get as much sleep as possible
C．to go on sleeping without being disturbed
D．to sleep till after the time you usually get up in the morning
61．Jan Born and his team carried out the experiment throughA．
A．comparison      B．interview
C．survey          D．imagination
62．It can be inferred from the passage thatC．
A．people should sleep so long as they have time
B．sleep is the only way to solve hard problems
C．people have various periods of sleep
D．people know how sleep rebuilds memories
63．What would be the best title for the passage？B
A．How Sleep Works．                 B．Sleep Helps Solve Problems．
C．No Evidence，But Well Founded．   D．Born's Discovery on Sleep．

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