题目内容

【C10】

A. to the point
B. in no case
C. in an attempt
D. with regard

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【C9】

A. after all
B. on the other
C. in any case hand
D. at a rest

【C7】

A. beneficial
B. disappointing
C. surprising
D. extreme

In nature, genetic diversity is created within certain【C8】. A rose can be crossed with different kind of rose, but a rose will never cross with a potato. Genetic engineering,【C9】usually involves taking genes from one species and inserting them into another【C10】to transfer a desired characteristic. This could mean, for example, selecting a gene which leads to a production of a chemical with anti-freeze【C11】from an arctic fish, and inserting it into a potato or strawberry to make it frost-resistant.【C12】, then, biotechnology allows humans to【C13】the genetic walls that separate species.
Like the green revolution,【C14】some call the gene revolution contributes to the problem of genetic uniformity--some say even more so【C15】geneticists can employ techniques such as cloning and【C16】culture (培养), processes that produce perfectly【C17】copies. Concerns about the erosion of biodiversity, therefore, remain. Genetically altered plants, however, raise new【C18】such as the effects that they may have on us and the environment. "We are flying blindly into a new【C19】of agricultural biotechnology with high hopes, few constraints, and little idea of the potential【C20】__," said science writer Jeremy Rifkin.
【C1】

A. manipulation
B. management
C. manufacture
D. maturity

【C2】

A. got along with
B. given rise to
C. come up with
D. lived up to