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A controversial decision on whether choice cuts of steak and cartons of milk produced from cloned animals are suitable for the d
A controversial decision on whether choice cuts of steak and cartons of milk produced from cloned animals are suitable for the d
admin
2010-02-22
37
问题
A controversial decision on whether choice cuts of steak and cartons of milk produced from cloned animals are suitable for the dinner table is now long overdue.
Hundreds of pigs, cows and other animals created with the help of cloning are living (1)_____ farms across the United States and (2)_____ the forthcoming ruling will directly (3)_____ American consumers, British holidaymakers may also (4)_____ themselves at the forefront of a food revolution that many commentators expect will (5)_____ arrive here.
(6)_____ the birth of Dolly the sheep—the first mammal cloned from an adult cell—there were extreme predictions of herds of genetically (7)_____ bulls and pastures (8)_____ with cloned dairy cows.
That double (9)_____ of the past decade has not yet been realized (10)_____ clones have become a familiar sight at agricultural fairs in America, where producers of (11)_____ pigs and cattle have been among the first to (12)_____ cloning, which offers a way to keep (13)_____ traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, (14)_____ a way to improve animal healthy, (15)_____ the nutritional value of meat and milk, and breed animals immune (16)_____ diseases or better suited for developing countries.
The safety of cloned (17)_____ has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18)_____ available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19)_____ scientific evidence suggests that there is little (20)_____ for alarm, at least on food-safety grounds.
选项
A、until
B、unless
C、then
D、but
答案
D
解析
逻辑衔接题。分析整句话的意思,前半部分讲到对于克隆动物的双重预测还未实现,后半部分大意是克隆动物在美国市场已司空见惯,由此可见,这两部分表达了相反的意思,所以应选but,表示并列转折关系。until意为"直到…才";unless意为"如果不,除非";这两个连词均引导从句,不可形成并列关系。then为副词,表示"当时,在那时"。
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0
考研英语一
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