What conclusion can we draw from the conversation?A．It is easy to pass the exam given by Mr．Smith．B．Mr．Smith often makes mistakes．C．Mr．Smith's course is difficult．题目和参考答案——青夏教育精英家教网—

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9．What conclusion can we draw from the conversation？
A．It is easy to pass the exam given by Mr．Smith．
B．Mr．Smith often makes mistakes．
C．Mr．Smith's course is difficult．

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解答 C

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20．What are the speakers talking about？
A．A nice hairstyle．
B．Their wedding．
C．An old photo．

17．Like people，plants experience stress．And also，like people，the response to that stress can determine success．
Bad environmental conditions，such as drought，flood，heat and other stresses，affect yields（产量） more than crop pests and diseases．We are trying to find a way to equip plants with the ability to tolerate nvironmental stress and maintain high yields，said Stephen Howell，a professor of genetics and cell biology．
Plant cells produce proteins （蛋白质） and ship them to different parts of the cell．Under normal conditions，these proteins are folded into their normal，healthy structures as they are produced．When a plant is under stress，its cells produce poorly folded or unfolded proteis．Then a built-in system senses this and"sets off an alarm in the cell，"said Howell．
In response to the alarm，another protein （IRE1）starts working and creates a different process which activates （激活） the stress response genes whose products bring about defensive measures that help the plant survive．
"As it turns out，responses that are activated under stress conditions actually inhibit the growth of plants，"said Howell．"This allows them to preserve their energy to survive the stress conditions．"
For plants in the wild，this response is a help for survival，he said．In production of agriculture crops，however，this response reduces yields．
"You don't want crop plants to stop growing，"Howell said．"You want them to continue to grow and produce even though they are under stress．"
With the new understanding of this stress response，the next step may be to silence the alarm system，said Howell．"What may be important is to disable some of these stress responses．That may make the plant more productive under stress conditions．"
8．According to the text，an alarm in the plant cells is caused byB
A．the folded proteins
B．the changed proteins
C．the defensive measures
D．the stress response genes
9．The energy preserved in the plants under stress conditionsA．
A．helps the plants to survive
B．helps to maintain high yields
C．keeps the plants growing
D．helps to produce proteins
10．The underlined word"inhibit"in Paragraph 5can bereplaced by"A"．
A．prevent
B．start
C．continue
D．promote
11．How does Howell intend to make crop plants maintain high yields under stress conditions？C
A．By making crop plants keep more energy．
B．By making crop plants stop growing．
C．By making the alarm system stop working．
D．By making the alarm system respond quickly．

4．听第10段材料，回答第17至20题．
17．When did Mr．Jones join the company？
A．Five years ago．
B．Thirty years ago．
C．Forty years ago．
18．What was Mr．Jones'first promotion？
A．Office manager．
B．Head driver．
C．Vice president of operations．
19．How did Mr．Jones get his degree？
A．By paying the fee himself．
B．By working part-time．
C．By taking night classes．
20．What is the main point of the talk？
A．To welcome a new employee．
B．To say goodbye to an old co-worker．
C．To congratulate Mr．Jones on his new career．

14．Scientists are trying to make the deserts into good land again． They want to bring water to the deserts，so people can live and grow food． They are learning a lot about the deserts． But more and more of the earth is becoming desert all the time． Scientists may not be able to change the desert in time．
Why is more and more land becoming desert？Scientists think that people make deserts． People are doing bad things to the earth．
Some places on the earth don't get much rain． But they still don't become deserts． This is because some green plants are growing there． Small green plants and grass are very important to dry places． Plants don't let the sun make the earth even drier． Plants do not let the wind blow the dirt away． When a bit of rain falls，the plants hold the water． Without plants，the land can become desert more easily．
21． DesertsD．
A． never have any plants or animals in them
B． can all be turned into good land before long
C． are becoming smaller and smaller
D． get very little rain
22． Small green plants are very important to dry places becauseD．
A． they don't let the sun make the earth even drier
B． they don't let the wind blow the soil away
C． they hold water
D． All of the above．
23． Land is becoming desert little by little becauseC．
A． plants can't grow there
B． there is not enough rain
C． people haven't done what scientists wish them to do
D． scientists know little about the deserts
24． Which is the main idea of the first paragraph？B
A． Scientists know how to change desert into good land．
B． Land is becoming desert faster than scientists can change it back into good land．
C． If scientists can bring water to desert，people can live and grow food there．
D． More and more places are becoming deserts all the time．

1．Would it surprise you to learn that，like animals，trees communicate with each other and pass on their wealth to the next generation？
UBC Professor Simard explains how trees are much more complex than most of us ever imagined．Although Charles Darwin thought that trees are competing for survival of the fittest，Simard shows just how wrong he was．In fact，the opposite is true：trees survive through their co-operation and support，passing around necessary nutrition"depending on who needs it"．
Nitrogen（氮） and carbon are shared through miles of underground fungi（真菌）networks，making sure that all trees in the forest ecological system give and receive just the right amount to keep them all healthy．This hidden system works in a very similar way to the networks of neurons（神经元）in our brains，and when one tree is destroyed，it affects all．
Simard talks about"mother trees"，usually the largest and oldest plants on which all other trees depend．She explains how dying trees pass on the wealth to the next generation，transporting important minerals to young trees so they may continue to grow．When humans cut down"mother trees"with no awareness of these highly complex"tree societies"or the networks on which they feed，we are reducing the chances of survival for the entire forest．
"We didn't take any notice of it．"Simard says sadly．"Dying trees move nutrition into the young trees before dying，but we never give them a chance．"If we could put across the message to the forestry industry，we could make a huge difference towards our environmental protection efforts for the future．
9．What would be the best title for the passage？C
A．Old Trees Communicate Like Humans
B．Young Trees Are In Need Of Protection
C．Trees Are More Complex Than You Think
D．Trees Contribute To Our Society
10．In Simard's opinion，treesA．
A．depend on each other
B．protect their own wealth
C．compete for survival
D．provide support for dying trees
11．We can learn from the passage thatD
A．"mother trees"are usually of no use to other trees．
B．Charles Darwin had the same thought as Simard．
C．people know much about the complex"tree societies"．
D．if"mother trees"are cut down，the survival for the entire forest will be affected．
12．The underlined word"it"in the last paragraph refers toB．
A．how trees grow old
B．how"tree societies"work
C．how forestry industry develops
D．how young trees survive．

18．听第9段材料，回答第15至17题．
15．What is the man's office number？
A.646-49966．
B.646-42266．
C.633-25646．
16．What does the man book？
A．Three bottles of red wine．
B．A table in the general hall．
C．A private room without a KTV．
17．When will the man get to the restaurant？
A．About 7：30 p．m．on Friday．
B．About 7 p．m．on Saturday．
C．About 7：30 p．m．on Saturday．

19．A.5，418 km
B.5，481 km
C.9，000 km
D.3，592 km．

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