Taking a cell, practically any cell,
from your body, the theory goes, and through appropriate biological
tinkering(摆弄) you can cause it to grow into a duplicate of yourself—identical
from eyelashes to toenails. No need for procreational(生育的) sex any more;{{U}}
(51) {{/U}}this system, you can neatly reproduce yourself without
a{{U}} (52) {{/U}}. Human cloning, it is called. Science fact or science
fiction What would happen if human cloning became a{{U}} (53) {{/U}}
One favorite scenario is the{{U}} (54) {{/U}}of a new{{U}} (55)
{{/U}}of Hitlers—or Einsteins. Scientists quickly disclaim the possibility.
"It is more than genetic make-up that makes an individual." Says Markert of Yale
University, "We are all products of a particular{{U}} (56) {{/U}}era and
of a special environment,
A. under
B. by
C. with
D. within
更多"阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内"的相关试题:
[单项选择] 阅读下面的短文，文中有15处空白，每处空白给4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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Where Did All the Ships Go
The Bermuda Triangle (三角区) is one {{U}} (51) {{/U}} the greatest
mysteries of the ses. In this triangular area between Florida, Puerto Rico
and Bermuda in Atlantic, ships and airplanes {{U}} (52) {{/U}} to
disappear more often than in {{U}} (53) {{/U}} parts of the ocean. And
they do so {{U}} (54) {{/U}} leaving any sign of an accident or any dead
bodies. It is {{U}} (55) {{/U}} that Christopher Columbus was the first
person to record strange happenings in the area. His compass stopped working, a
flame came down from the sky, and a wave 100 to 200-feet-high carried his ship
about a mile away.
The most famous disappearance in the Bermuda
Triangle was the US Naval (海军的) Air Flight 19．{{U}} (56) {{/U}} Decembe
A. from
B. of
C. about
D. on
[单项选择] 阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。
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Taking a Nap during the Day
Medical experts say most Americans do not get {{U}} (51) {{/U}}
sleep. They say more Americans need to rest for a short period in the middle of
the day. They are advising people to sleep lightly before {{U}} (52)
{{/U}} with other activities.
One study earlier this year
found that persons who sleep for a few minutes during the day were less
{{U}} (53) {{/U}} to die of disease. The study followed more than 2,300
Greek adults {{U}} (54) {{/U}} about six years. Adult who rested for half
an hour {{U}} (55) {{/U}} three times a week had a 37 percent lower risk
of dying from heart disease than those who did not nap.
Study
organizers said the strongest evidence was in working men. They said naps might
improve
A. ready
B. good
C. sleepy
D. awake
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