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  3. 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

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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、as
B、when
C、while
D、if
答案C
解析 逻辑衔接题。本句包括一个that引导的宾语从句，从句前一部分提到：早在三年前已掌握的数据就表明，克隆产品符合动物保护和食品安全方面的考虑，然而后一句又说需要获取更多的信息，可见两者之间是转折关系，因此应选while，意为"虽然"。as，when，if没有转折的意思，不合题意。
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考研英语一

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