Most scientists agreed that cloning an entire human being-besides morally
questionable-was filled with technical problems. After all, research into animal cloning
has already shown that there are hundreds of failures, includingmanybadlydeformed
(畸形的)creatures that were usually miscarried.
Now comes word that it might be easier to clone humans than was previously
believed. People have a genetic quirk(怪癖) that might prevent some of the
developmental deformities associated with animal cloning. One gene, called IGF2R,
is normally imprinted in sheep, cows and mice but not in humans. Human clones would
always inherit non-imprinted IGF2R genes, so there would be no chance of a mix-up
and, their growth would be normal. But what of the other 49 0r so imprinted genes
(遗传基因 ) ?No one knows what troublethey might cause. So the fact humans have
one less imprinted gene than mice, sheep or cows means that human
cloningmightbemarginally (轻微地 ,很少地 ) easier , but not necessarily safer.
科目:高中英语 来源: 题型:053
阅读理解
I'm sure you know the song “Happy Birthday”. But to you know who wrote the song, and for whom it was written?
A professor named Archibald Hill in Lousiville, USA could tell us the story. Ninety-seven years ago, two of Mr. Archibald Hill’s aunts, Miss Patty Hill and Miss Mildred Hill, were asked to write songs for a book called“ Song Stories for the Sunday Morning”. Miss Patty Hill and Miss Mildred Hill were both kindergarten teachers then. They loved children very much and wrote many beautiful songs for the book. Out of them was the well-known“ Good Morning to You”. The song was very popular at that time among kindergarten children, but many grownups knew it, too. A few years later, little Archibald was born. As his aunt, Miss Patty Hill sang the song “Happy Birthday to You” to the melody of “Good Morning to You” to her little nephew, she sang the song like this:
Happy birthday to you!
Happy birthday to you!
Happy birthday, dear Archie !
Happy birthday to you.
Miss Patty Hill and her sister had never expected that this song became popular, but it really did. People all over the world like the song because of its simple tune and
friendly words.
(1)Archibald Hill was ________.
[ ]
A. English
B. American
C. Russian
D. Australian
(2)Miss Patty Hill and Miss Mildred Hill wrote ________ for the book “Song Stories for the Sunday Morning”.
[ ]
A. a book
B. some plays
C. many songs
D. some stories
(3)The professor, Archibald Hill, was Miss Mildred Hill's ________.
[ ]
(4)The song “Happy Birthday” has a history of ________ years.
[ ]
A. ninety-seven
B. more than ninety-seven
C. less than ninety
D. about ninety
(5)The sentence “it really did” means ________.
[ ]
A. the song really became popular.
B. their wish really came true
C. children all over the world like the song
D. the song became more popular
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