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听力原文:W: How did you become a bike messenger?
M: My brother was a bike messenger and he broke his finger. I was working as a security guard and his bike and his bag and his lock were sitting there and I was like,' Oh, let me try', because I wasn't having fun as a security guarD.So I tried it and ended up liking it.
W: Do you know how many messengers work in New York?
M: I heard it's something like 3000. Some people say morE.Just bicycle messengers sending packages, maybe like 1500. But if you count food delivery, it's like 5000 or morE.A lot of people in New York do it as a regular joB.I know people who have families and everything.
W: How can one become a messenger? There are big and small companies? Basically you just go there and register?
M: You don't really register, you just get a joB.Some companies, you need to give them your social security number for taxes and stufF.Some companies, they don't even ask your last namE.I think it's one of the only jobs that doesn't check your record, I mean, a lot of people we work with could've been in jail beforE.
How many bike messengers are there who send packages in New York?
A.About 3000.
B.About 2000.
C.About 1500.
D.About 5000.

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单项选择题
听力原文: What is cloning? Cloning is the creation of cells or whole animals using DNA from a single 'parent', bypassing the normal reproductive process. The clone has the same DNA as the parent.The most common process takes DNA from one cell and puts it in a hollowed-out egg. Chemicals and electricity are then used to encourage the new DNA to fuse with the egg and develop into an embryo. This technique is called nuclear transfer.The first cloned animal in human history was a sheep called Dolly. It was very important because it was the first mammal to be cloned using DNA taken from an adult cell. Previously, animals had only been cloned using embryo cells, which already have the potential to become complete embryos in their own right. The big breakthrough with Dolly was that a clone was made from an ordinary, adult cell.When it comes to the question of whether cloned animals are normal and healthy, the answer is YES. Dolly is, but scientists do not yet know whether this is the exception or the rulE.Some early evidence suggests that clones may have health problems and that they may age prematurely.With the birth of Dolly, many people are worried that a human clone may be born soon. It's possible in theory. But the technology of reproductive cloning is still in its very early stages and there is much that scientists do not understanD.What's more, human cloning is already banned by law in the United Kingdom. The former President of the United States, Bill Clinton, proposed banning research into producing human clones in the U. S. for five years. Some measures have also been taken to establish international agreements banning live human clones.What has cloning bypassed?A.The nuclear transfer.B.The process of taking DNAC.The normal reproductive process.D.The creation of cells.
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People appear to be born to computE.The numerical skills of children develop so early and so inexorably that it is easy to imagine an internal clock of mathematical maturity guiding their growth. Not long after learning to walk and talk, they can set the table with impressive accuracy one plate, one knife, one spoon, one fork, for 'each of the five chairs. Soon they are capable of noting that they have placed five knives, five spoons, and five forks on the table and, a bit later, that this amounts to fifteen pieces of silverwarE.Having thus mastered addition, they move on to subtraction. It seems almost reasonable to expect that if a child were secluded on a desert island at birth and returned seven years later, he or she could enter a second-grade mathematics class without any serious problems of intellectual adjustment.Of course, the truth is not so simplE.In this century, the work of cognitive psychologists has illuminated the subtle forms of daily learning on which intellectual progress depends. Children were observed as they slowly grasped--or, as the case might be, bumped into--concepts that adults take for granted, as they refused, for instance, to concede that quantity is unchanged as water pours from a short stout glass into a tall thin onE.Psychologists have since demonstrated that young children, when asked to count the pencils in a pile, readily report the number of blue or red pencils, but must be coaxed into finding the total. Such studies have suggested that the rudiments of mathematics are mastered gradually, and with effort.They have also suggested that the very concept of abstract numbers--the idea of a oneness, a twoness, a threeness that applies to any class of objects and is prerequisite for doing anything more mathematcally demanding than setting a table--is itself far from innatE.What does the passage mainly discuss?A.Trends in teaching mathematics to children.B.The use of mathematics in child psychology.C.The development of mathematical ability in children.D.The fundamental concepts of mathematics that children must learn.
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