3. D。细节题。根据文章第 4 段第
2 句 This is mainly because many
parents know little or nothing about the good points of the resinous glasses 可推知此题答案为 D。
(18)
With
only about 1, 000 pandas left in the world, China is desperately trying to
clone(克隆) the animal and save the
endangered species(物种). That’s similar to what
Texas A&M University researchers have
been undertaking(负责) for the past five years in a
project called “Noah’s Ark”.
Noah’s
Ark is aimed at collecting eggs, embryos(胚胎),
semen and DNA of endangered animals and storing them in liquid nitrogen(氮). If certain species should become
extinct, Dr. Duane Kraemer, a professor in Texas A&M’S College of Veterinary Medicine, says
there would be enough of the basic building blocks to reintroduce the species
in the future.
It is
estimated that as many as 2, 000 species of mammals, birds and reptiles will
become extinct in over 100 years. The panda, native only to China, is in danger
of becoming extinct in the next 25 years.
Chinese
scientists said they grew an embryo introducing cells from a dead female panda
into the egg cells of a Japanese white rabbit. They are now trying to implant
the embryo into a host animal.
The
entire procedure(过程) could take from three to
five years to complete.
“The
nuclear transfer(核子移植) of one species to another is
not easy, and the lack of available(capable of being used) panda eggs could be
a major problem,” Kraemer believes. “They will probably have to do several
hundred transfers to result in one pregnancy(having a baby). It takes a long
time and it’s difficult, but this could be groundbreaking science if it works.
They are certainly not putting any live pandas at risk, so it is worth the
effort,” adds Kraemer, who is one of the leaders of the Project at Texas A&M, the first-ever attempt at cloning a
dog.
“They
are trying to do something that’s never been done, and this is very similar to
our work in Noah’s Ark. We’re both trying to save animals that face extinction.
I certainly appreciate their effort and there’s a lot we can learn from what
they are attempting to do. It’s a research that is very much needed.”