17．lose heart灰心.失去信心．——青夏教育精英家教网—

17．lose heart灰心，失去信心．

16．There is much discussion about the necessity of daily homework for students．Some say homework is necessary since only practice （36）makes （make） perfect，while others disagree．In my opinion，daily homework is necessary for students．However，this might be misleading that one may believe all forms of homework （37）are（be） necessary．Actually，only proper amount of homework in proper form is （38）acceptable（ accept）； some homework may not only fail to help the students，but on（39）thecontrary bore them so much that they may lose their interest in studying．"Proper"homework，in my opinion，should （40）vary（vary） in its forms，（41）which might be some extensive reading，a paper，or even just a game，as well as other ordinary exercise．And it should leave enough （42）freedom （free） to the students so that they could do things they really like to do with self-motivation，rather than unwillingness．We should always remember that homework is something for us to guide the students，rather than （43）drive （drive） them．Only if a teacher （44）keeps （keep） this（45）in his/her mind，the homework could be of most help to the students．

15．Humans and animals have always lived together．For example，many people have dogs in （61）their homes．Dogs （62）are （be）very affectionate animals．They are also very sensitive to the feelings of the people with（63）whom they live，and it seems quite natural （64）to have （have） them in our houses．（65）But all the many different types of dogs come from one species of animal，the grey wolf．These wild animals came into villages 12，000years ago，（66）looking （look） for food．People found that wolves could help in the （67）daily （day） struggle for survival by guarding their homes and （68）hunting （hunt） wildlife to kill and eat．In some very cold parts of Northern Canada，the skin of very old dogs is still used （69）for warm clothes．Dogs are useful and many people love them-that is why they （70）are called （call）"man's best friend"．

14．When I was 10years old，my dad gave me the responsibility of （61）feeding（feed）chickens and cleaning up the stable．He believed （62）it important for me to learn responsibility from those jobs．
When I was 22，I found a job in New York at a country music club，（63）where I washed dishes，cooked and sang until 2：00in the morning．I soon became （64）known（know）as a singing cook．However，I （65）was refused/had been refused（refuse）every time I tried to sign with record （66）companies（company）．
One night，（67）a/one woman from a company named Warner Brothers Records came to hear me sing．After the show，we sat down and talked．Several weeks （68）later（1ate），my manager received a phone call-warner Brothers wanted （69）to sign（sign）me to a record deal．
My best efforts had gone into every job I ever held．It was the sense of responsibility that made me （70）feel（feel）like a man．

13．Talking plants might sound like characters in a fairy tale．But recent scientific studies have shown that plants communicate with each other and with other living things in a surprising number of ways．To understand them，scientists say，we just have to learn their language．Farmers are especially interested in what plants have to say．
"Plants are able to communicate with all sorts of organisms（有机体）．They can communicate with giant bacteria，with other plants and with insects．They do this chemically，"said Cahill，an Ecology Professor of the University of Alberta in Canada．
Plant scientists are just beginning to understand this chemical"language"．Cahill says studies have shown，for example，that plants can evaluate conditions in their immediate environment and take appropriate actions．Plants have an ability，for example，to signal pain or discomfort caused by anything from temperature extremes to an insect attack．Jack Schultz，a professor of chemical ecology at the University of Missouri．says when a plant senses that it's being eaten，it cannot walk away from trouble；on the contrary，it will release a chemical vapor that alerts other plants nearby．
"Their language is a chemical language，and it involves chemicals that move through the air，which are easily to be changed．and most of all are smells that we are familiar with，"Schultz ex-plained．
"All plants responded to the attack by changing their chemistry to defend themselves，"Schultz recalled．"But we were quite surprised to find that nearby plants also changed their chemistry to defend themselves，even though they were not part of the experiment．"
Studies have also shown that plants under attack release pleasant chemicals．Those chemicals attract friendly insects that attack the pests eating the plant．

32．The recent scientific studies have shown that plants canD．
A．respond to the attack by giving off poisonous chemicals
B．hardly react to any sudden change in temperature
C．use a very special chemical language which is familiar to us
D．communicate with other living things in a chemical way
33．When being eaten by a pest，the plant willC．
A．walk away from trouble
B．change its chemistry to kill the insect
C．give off chemicals to attract friendly insects to attack the pest
D．release a chemical vapor to"ask"other plants for help
34．The underlined word"alerts"most probably means"B"．
A．protects
B．warns
C．threatens
D．allows．
35．Which of the following would be the best title for the passage？A
A．How Plants"Talk"
B．Plants and Insects
C．Recent Scientific Studies
D．How to Understand Plant Languages．

12．Mr．Brown had an umbrella shop in a small town．People sometimes brought him （61）broken（break） umbrellas，and then he took them to a big shop in London．They （62）were mended（mend） there．
One day Mr．Brown went to London by train．He （63）forgot（forget） to take an umbrella with him that day．Sitting in front of him was a man with an umbrella （64）standing （stand） beside the seat．When the train arrived （65）in London，Mr．Brown picked up the umbrella as he often did during his journey by train．Just as he was getting off，he was stopped by the man．He said （66）angrily （angry），"That's （67）mine（me）!"Mr．Brown's face turned red and he gave （68）it back to the man at once．
When Mr．Brown got to the big shop，the shopkeeper had got his six （69）umbrellas（umbrella） ready．After a good look at each of them，he said，"You've mended them very well．"
In the afternoon he got into the train again．The similar man was in the same seat．He looked at Mr．Brown and his six umbrellas，"You've had a （70）lucky（luck） day，"he said．

11．Judging from the evidence，what he said isreliable （rely）．

10．It took several hours before the volunteers sent the peopleinjured （injure） in the car accident to the nearby hospital．

9．As adevoted （devote） teacher，he could hardly spare any time to accompany his family．

8．According to the report，only 300people survived in the earthquake last week．

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