While by school rules high school students use cell phones in the school.they can use public phones to keep in touch with friends and family．( )A．mustn'tB．shan'tC．wouldn'tD．mightn't 题目和参考答案——青夏教育精英家教网—

题目内容

17．While by school rules high school students _________ use cell phones in the school，they can use public phones to keep in touch with friends and family．（　　）

A．

mustn't

B．

shan't

C．

wouldn't

D．

mightn't

分析虽然根据学校规定高中学生在学校不允许用手机，他们可以用公共电话与朋友和家人保持联系．

解答答案是B．本题考查情态动词shall的用法．情态动词shall常常用来表示法律或条文的规定．根据句意可知，学校的规定属于条文的规定，所以本题答案选择B．

点评要在正确理解情态动词的基本含义的基础上，整体理解语境中的情感态度，做出合理的判断．

练习册系列答案

8．Humans aren't the only ones getting a buzz from coffee．Caffeine can improve memory among honeybees and lead to better pollination（授粉）．According to a recent study published in the journal Science．
The study was conducted by a team of researchers at Newcastle University in the United Kingdom．They found that the nectar（花蜜） of some flowers，such as those from grapefruit and lemon plants，as well as certain coffee flowers，contains low doses of caffeine．To get bees to feed on these flowers，the team trained the insects to associate food with the smell of the flowers．They also trained another group of bees to feed on nectar from flowers that were sweetened with a sugar，but did not contain caffeine．After 24 hours，the bees trained on caffeinated flowers returned to these plants three times as often as those trained on the sweetened flowers returned to the uncaffeinated plants．
Professor Geraldine Wright led the researchers．"Remembering floral traits （花部特征） is difficult for bees to perform at a fast pace as they fly from flower to flower and we found that caffeine helps the bee remember where the flowers are，"Wright said in a statement．
Improved memory led to the better pollination．That's because once bees sip the caffeine nectar，they continue to look for more coffee plants to pollinate．This also suggests that caffeine plays a role in improving the bees'ability to search for food．
Researchers found that caffeine's effect on the bee brain is similar to its effect on mammals．"The change is similar to that produced by caffeine in neurons （神经元）"associated with learning and memory in the rat brain，"Wright said．
Bee populations have declining since 2007．The dramatic drop in the insects'numbers has serious effects for ecosystems and the farming industry．Bees are needed in the reproduction of crops and spreading wild flower species．Understanding what keeps bees buzzing could help to make sure that the insects are able to remember and pollinate their favorite flowers．

56．Which of the following is mentioned in the passage？C
A．Caffeine has no effect on the rat brain．
B．Bee population has been increasing．
C．The nectar of lemon plants contains caffeine．
D．Bees dislike nectar from sweetened flowers．
57．After reading the passage，John，who works in the farming industry，will probably feelD．
A．annoyed
B．angry
C．nervous
D．excited
58．Which of the following relationship is correct according to the passage？B
A．improved memory-caffeine nectar-better pollination
B．caffeine nectar-improved memory-better pollination
C．improved memory-better pollination-caffeine nectar
D．caffeine nectar-better pollination-improved memory
59．We can know from the passage thatA．
A．the rat is a mammal
B．caffeine has nothing to do with memory
C．bees are good at remembering floral traits
D．Geraldine Wright did the research on his own
60．What section of a newspaper may this passage be taken from？A
A．Science
B．Education
C．Culture
D．Sports．

5．-Must I turn off the gas after cooking？
-Of course．You can never be ____________careful with that．（　　）

12．The 12^th Provincial Sports Meet in our city in August will turn out to be a great success．（　　）

2．We are ensured that there are enough textbooks for each student to have _______ when the new semester comes．（　　）

9．Millions of people working or studying out of their hometowns ________ home to reunite with families as the Chinese Spring Festival approaches．（　　）

	A．	have hurried		B．	hurry
	C．	will be hurrying		D．	hurried

6．A woman was walking her dog along a beach in New Zealand in late June when she saw something that looked like a white ball in the sand．It turned out to be a young Emperor penguin that was lost．At his age，he should have been close to the Antarctic，swimming for fish and playing on the ice floes（冰川）．But this penguin started swimming north and just kept going．
The penguin attracted a lot of attention in New Zealand．It has been 40years since an Emperor penguin was last seen there．Researchers at the Department of Conservation were called in．They decided to watch the penguin closely，but not to disturb it in any way．Many New Zealanders came to Peka Beach to look at the elegant penguin．They were careful to keep their dogs away from it so it wouldn't be frightened．
The public nicknamed the animal Happy Feet．Researchers started to notice that Happy Feet didn't seem well．It turns out that he had been eating the sand from the beach，likely thinking it was snow．
The public raised more than 11，000pounds for an operation to get the sand out of his stomach．The operation was a success，and Happy Feet was taken to a zoo in Wellington，NZ．A group of experts met to decide how to help Happy Feet return to the wild．
Last Sunday，they put him on a boat called the Tangaroa，in a specially built ice-filled box and took him out into the Southern Ocean，southeast of New Zealand．There，they released him into the ocean，which is his natural habitat．He took one last look at his human helpers and then dived into the ocean．
"Emperor penguins spend their first five years at sea，"said Peter Simpson of New Zealand's Department of Conservation．"What happens now is up to the penguin．"
Happy Feet was fitted with a satellite transmitter（发射机）so they can monitor his progress using the Internet．So far，the trackers shows that he swam northeast for a little while before getting his bearings and heading south．

28．Where is the young penguin supposed to appear？B
A．On the sunny beach
B．Near the Antarctic．
C．Inside the hole in the ice．
D．In the depths of the ocean．
29．How was the penguin treated after he was found in New Zealand？B
A．He was sent to the local zoo and attracted much attention．
B．He was protected well and taken good care of．
C．He was taken to the lab by researchers for study．
D．He was disturbed by many curious New Zealanders．
30．The public collected some money toA．
A．get the sand out of the penguin's belly
B．build a home for the penguin
C．do some research on the penguin
D．return the penguin to his habitat
31．What happened to the penguin in the end according to the passage？D
A．He was put in a specially built ice-filled box on a boat．
B．He was bought to the Southern Ocean and released．
C．He reached his home--The Antarctic．
D．He swam northeast from the the Southern Ocean..

7．Childhood obesity（41）is considered（consider） one of the most serious health challenges of the 21st century．Obesity can（42）harm（harmful） nearly every organ in a child's body---heart and lungs，muscles and bones，kidneys as well as the hormones（荷尔蒙）（43）that/whichcontrol blood sugar and puberty（青春期）．What's worse，young people who are overweight or obese are likely to remain so even when they grow into adulthood，（44）increasing（increase）the risk of developing disease and disability later in life．
Globally，an（45）estimated（estimate） 43million preschool children under the age of 5were overweight or obesity in 2010，a 60% increase since 1990．The problem affects countries rich and poor，and places the greatest burden（46）onthe poorest：of the world's 43million overweight and obese preschoolers，35million live in developing countries．By 2020，if the current epidemic（盛行） continues，9% of all preschoolers will be overweight or obese---nearly 60million children．
Obesity rates are higher in adults（47）thanin children．But in relative terms，the U．S．，Brazil，China，and other countries have seen the problem arise more（48）rapidly（rapid） in children than in adults．
Of course，some regions still struggle hard with child（49）hunger（hungry），such as Southeast Asia and Africa．But globalization has made（50）theworld wealthier，and wealth and weight are linked．

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