细菌（bacterium）

汉泽英：“数量；合同”，正确的翻译为：（）。
A. bacterium ； content
B.quantity ； commodity
C. protein ； content
D.quantity ； contract

共用题干
第一篇

Genetic Engineering

Genetic engineering began when the DNA molecule（分子）,the most basic unit of life , was first
described in 1953 by James Watson and Francis Crick.An understanding of DNA led to the altering of
normal cell reproduction.Experiments with altering human cells began in 1970.In one of the first
experiments,patients were injected with a virus that would produce a life-saving enzyme,but their bodies
would not accept it.In 1980 patients with a rare but fatal blood disease were injected with a purified gene
that was cloned through DNA technology.Another failure.
Genetic engineering got a legal boost（激励）in 1980. The U. S. Supreme Court said that a patent could
be granted on a genetically engineered "oil-eating" bacterium（细菌）.This bacterium would help clean up
oil spills.The ruling encouraged companies to invent new life forms,and three important medical products
were quickly developed.
1.Human interferon（干扰素）—a possible solution to some cancers and viral diseases.A newly engineered
bacterium produced human interferon as a by-product. This new product reduced the cost of interferon.
2. Human growth hormone（荷尔蒙）一for children whose bodies do not grow to normal height. An
expensive growth hormone was previously produced from human cadavers,but by changing the genetic make-
up of the single-cell bacterium E.coli,and affordable growth hormone could be produced.
3. Human insulin（胰岛素）一for the treatment of diabetes. People with diabetes used to rely on a beef-
or-pork-based product until 1982.Now insulin can be manufactured by genetically altered bacteria.
Advances in genetic engineering have continued,though they constantly must be weighed against the
safety of procedures.There is clearly much more to discover.

In this passage,the three genetically engineered medical products are presented_________.
A:as a process
B:in a simple list
C:from earliest to latest
D:as a story