It seems like science fiction,but it's already a reality:mil

It seems like science fiction,but it's already a reality:milk from cloned cows,and it's coming to a grocery store near you unless the federal government decides to intervene (干涉).
An experimental dairy farm in Wisconsin is producing some of the world's first milk from a herd of 21 cloned cows,17 of them from the same original animal,all genetically identical.
Infigen,the biotech (生物工程) company that runs the farm,says its cows are normal and healthy,and the milk looks and tastes just like any other.The lack of any completed scientific study on the milk's safety doesn't stop Infigen's president,Michael Bishop,from pouring himself a glass."It's delicious," he said.
To date there is nothing to stop him.The Food and Drug Administration (FDA) has asked biotech companies to voluntarily refrain from selling animal products derived from clones,but there are no laws in place.The FDA is waiting for the National Academy of Sciences to complete a review of the safety of cloned animal products.The report is expected sometime in January.
Infigen has agreed to wait until the federal report comes out before marketing its milk,but it's mostly a public relations move.Bishop has learned from the widespread public mistrust of genetically engineered foods.
Cloned animals are not considered genetically engineered (their DNA has not been modified in any way,simply copied),and Infigen wants to make sure the public understands the distinction."We have to be diligent in getting in front of consumer groups.We need to put together the data,go out and tell them about this."
Groups that monitor genetically engineered foods say they are also concerned about cloned animal products,only because we know so little about their safety.
"We don't know what the genetic ramifications (支流) would be and how it would play out with products from the animals," said Joe Mendelson,legal director for the Washington-based Center for Food Safety.
16Which of the following is NOT a feature of cloned cows?
A.They are of the same origin.B.They have entirely the same genes.C.They are genetically identical.D.They produce milk.
17.When can the milk from cloned cows be sold at grocery stores?
A.When the federal government stops intervening.B.After the cows prove normal and healthy.C.When the milk proves to be safe to drink.D.After Infigen's president drinks the milk himself.
18.Why can't the FDA stop Infigen from selling its milk?
A.Because there's no law to prohibit it from selling the milk.
B.Because the National Academy of Sciences can prove the safety of cloned animal products.C.Because most people like the milk from cloned cows.D.Because Infigen can show their consumers that its milk is normal.
19.The term "genetically engineered" most probably means ________.
A.the DNA has been modifiedB.the DNA has become irregular
C.the DNA has been copiedD.the DNA has become abnormal

考虑一下：
16.D
17.C
18.A
19.A