Research advances over the past decade have told us that, with a little work, we humans can clone just about anything we want, from frogs to monkeys and probably even ourselves!
So, we can clone things, but why would we want to?
Of all the reasons, cloning for medical purposes has the most potential to benefit large numbers of people. How might cloning be used in medicine?
1. Cloning animal models of disease
Much of what researchers learn about human disease comes from studying animal models such as mice. Often, animal models are genetically engineered to carry disease-causing mutations(变异) in their genes. Creating these transgenic（转基因的） animals is a time-intensive process that requires trial-and-error and several generations of breeding（培育）. Cloning technologies might reduce the time needed to make a transgenic animal model, and the result would be a population of genetically identical animals for study.
2．Cloning stem cells(干细胞) for the treatment of diseases
Stem cells are the body's building blocks, responsible for developing and repairing the body throughout life. As a result, they might be used to repair damaged or diseased organs and tissues. Researchers are currently looking up cloning as a way to create certain human stem cells for the research of diseases.
3. Cloning farm animals for drug production
Farm animals such as cows, sheep and goats are currently being genetically engineered to produce drugs or proteins that are useful in medicine. Just like creating animal models of disease, cloning might be a faster way to produce large herds of genetically engineered animals.
1.From Purpose One, we can infer that .
A．most transgenic animals are clone
B．most animals carry engineered genes
C．most transgenic animal models are not cloned
D．most animals carry disease-causing mutations in their genes
2.It can be learned from Purpose Two that cloning technologies can be mainly use do .
A．create damaged or diseased organs and tissues
B．clone genetically defined human stem cells
C．develop and maintain the body
D．repair the body throughout life
3.According to Purpose Three, cloning technologies can be mainly used to .
A．speed up the producing of genetically engineered animals
B．produce drugs or proteins that are useful in medicine
C．raise genetically engineered cows, sheep and goats
D．produce large herds of animals for human beings
With the introduction of family planning policies in the 1970s, most Chinese teenagers have no brothers or sisters．They get to be the beloved（心爱的）__36__child．But they may not realize that they will have to “__37__”the love as their__38__ones grow old．They will have to__39__lots of old people—their parents, grandparents, their__40_parents and grandparents．China is being__41__country．
According to the United Nations, an aging society refers to one 42 10 percent or more of the population is over 60, or 7 percent or more is over 65. According to 43 from the Ministry of Civil Affairs, by 2008, Chinese over 60 years old made up 12 percent of the nation’s total population. The 44 for those aged 65 or older was 8.3 percent.
In China, people have a belief that “parents raise children; then the children care for the parents as they get old”．But this__45__is under stress as the market ey puts millions of young Chinese on the road__46__better paying jobs．They are leaving their parents__47 ．Now many families are looking more to the government than to their__48__for support when they’re old．China has increased its basic social security（基本社会保险）plan which is__49__protecting those__50__, including the old, the disabled and others．These programs are now broad, __51__they are still not highly developed．
As more people grow__52__, China will have fewer working people, __53__will slow down economic growth. According to a November 26 report in the Economic Information Daily, an expert said China should 54 its people to have more than one child in the future 55 China should keep its labor population and total population size stable(稳定的).
1.A．only B．lonely C．friendly D．heartily
2.A．take up B．take back C．pay back D．pay for
3.A．hated B．loved C．tired D．hearted
4.A．care for B．bring up C．look for D．pay attention to
5.A．daughter’s or son’s B．niece’s or nephew’s
C．wife’s or husband’s D．aunt’s or uncle’s
6.A．an old B．an aging C．a developing D．a developed
7.A．where B．when C．which D．that
8.A．an article B．an email C．a magazine D．a report
9.A．conclusion B．character C．figure D．survey
10.A．tradition B．opinion C．saying D．way
11.A．in favor of B．in search of C．in the way of D．in the face of
12.A．out B．off C．ahead D．behind
13.A．friends B．relatives C．parents D．children
14.A．an act B．a case C．a program D．a plan
15.A．in danger B．in need C．in desperate D．in disaster
16.A．but B．or C．and D．so
17.A．strong B．realistic C．rich D．old
18.A．as B．which C．what D．that
19.A．forbid B．promise C．encourage D．order
20.A．so that B．though C．even if D．because
My friend Li Ping felt when he was not admitted into the university.
A．cooled down B．cast down C．taken down D．out down
—Why are you so nervous?
—To our great surprise, we found by the strangers.
A．we monitored B．ourselves monitored
C．us to monitor D．ourselves monitoring
This printer is of good quality. it break down within the first year.
A．Should B．Would C．Could D．Might
The sun was shining brightly, everything there more beautiful.
A．making; look B．to make; looked C．and made; looking D．and making; be looked
