We firmly believe that the project.if according to the plan.will definitely workout well．( )A．carrying outB．being carried outC．carried outD．to be carried out 题目和参考答案——青夏教育精英家教网—

12．Passenger pigeons（旅鸽） once flew over much of the United States in unbelievable numbers．Written accounts from the 18^th and 19^th centuries described flocks（群） so large that they darkened the sky for hours．
It was calculated that when its population reached its highest point，there were more than 3billion passenger pigeons-a number equal to 24to 40percent of the total bird population in the United States，making it perhaps the most abundant bird in the world．Even as late as 1870when their numbers had already become smaller，a flock believed to be 1mile wide and 320miles （about 515kilometers） long was seen near Cincinnati．
Sadly，the abundance of passenger pigeons may have been their undoing．Where the birds were most abundant，people believed there was an ever-lasting supply and killed them by the thousands．Commercial hunters attracted them to small clearings with grain，waited until pigeons had settled to feed，then threw large nets over them，taking hundreds at a time．The birds were shipped to large cities and sold in restaurants．
By the closing decades of the 19^th century，the hardwood forests where passenger pigeons nested had been damaged by Americans'need for wood，which scattered （驱散） the flocks and forced the birds to go farther north，where cold temperatures and spring storms contributed to their decline．Soon the great flocks were gone，never to be seen again．
In 1897，the state of Michigan passed a law prohibiting the killing of passenger pigeons，but by then，no sizable flocks had been seen in the state for 10years．The last confirmed wild pigeon in the United States was shot by a boy in Pike County，Ohio，in 1900．For a time，a few birds survived under human care．The last of them，known affectionately as Martha，died at the Cincinnati Zoological Garden on September 1，1914．

51．In the 18^th and early 19^th centuries，passenger pigeonsD．
A．were the biggest bird in the world
B．lived mainly in the south of America
C．did great harm to the natural environment
D．were the largest bird population in the US
52．The underlined word"undoing"probably refers to the pigeons'B．
A．escape
B．ruin
C．liberation
D．evolution
53．What was the main reason for people to kill passenger pigeons？C
A．To seek pleasure．
B．To save other birds．
C．To make money．
D．To protect crops．
54．What can we infer about the law passed in Michigan？B
A．It was ignored．
B．It was too late．
C．It was unfair．
D．It was strict．
55．Which of the following is the best title of the passage？C
A．The protection of passenger pigeons．
B．The abundance of passenger pigeons．
C．The disappearance of passenger pigeons．
D．The population of passenger pigeons．

11．You go to a store to buy food for a party．But when you get to the cash register，there are no plastic bags for the things you buy．If you live in San Francisco，this situation might not surprise you．（71）FMany cities and towns around the United States may ban plastic bags．（72）GInstead，they'd like people to use their own cloth bags when they shop．（73）DThey say they wouldn't buy as much if they couldn't get a free bag．Store owners don't want to lose business．So they want to keep offering plastic bags．
Stores should be banned from using plastic bags．Here's why：
All those plastic bags fill up garbage dumps （垃圾站）．That hurts the environment．
People can use cloth bags instead．（74）AStores should not be banned from using plastic bags．Here's why：
People might buy less if stores don't offer plastic shopping bags．Some stores might go out of business．
Some people reuse plastic shopping bags for things like garbage．If they don't get them for free，they'll have to buy some．（75）CThat could get expensive．

A．These bags don't get thrown away until they've been used many times．
B．There should always be a choice．
C．If shoppers forgot a cloth bag，they would have to buy one．
D．But many people don't want to buy their own cloth bags．
E．Many people throw them away after using them．
F．That city has banned most plastic shopping bags from stores．
G．They hope that shoppers won't use paper bags either．

7．The Internet gives students the chance to have the materials they need ______to them quickly and cheaply．（　　）

A．

	A．	carrying out		B．	being carried out
	C．	carried out		D．	to be carried out

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