更多"About three hundred years ago in It"的相关试题:
[简答题] About three hundred years ago in Italy, there lived a young man whose name was Galileo. He was always thinking and always asking the reasons for things.
One evening when he was only eighteen years old he was in the cathedral at Pisa at about the time the lamps were lighted. From the (47)________lamps were hung by long rods. (48)________ the lamplighter knocked against them, or the wind blew through the (49)______ they would swing back and forth like pendulums. Galileo noticed this, then he began to study them more closely. As Galileo watched them swinging to and fro he became much (50)______.
When he went to his room he began to (51)______ He took a number of cords of different (52)______ and hung them from the ceiling. To the free end of each cord he fastened a weight. Then he set all to swinging back and forth, like the (53)______ in the cathedral. Each cord was a pendulum, just as each rod had been.
(54)______, to the swinging lamps in the cathedral, and to Galile
[单项选择]
Passage Three
Three years ago, researchers announced the discovery
of human genes that were capable of turning ordinary cells into malignant ones.
The news met with some skepticism. Experts asked how a single gene could cause
such a dramatic change. Why does cancer take years or even decades to develop if
it is caused by such a simple and direct process In last week’s issue of the,
three research teams answered those questions by setting forth a new model for
understanding the role of oncogenes in cancer.
Each group found
that it does in fact take more than a single gene to produce cancer in normal
cells. Teams at M. I. T and Cold Spring Harbor Laboratory on Long Island, N. Y.
, reported that they could induce cancer in normal rat cells only by inserting
at least two types of oncogene into the cells. "A single oncogene produced some
changes,
A. was caused by normal cells
B. sometimes resulted from internal actions of the victim’s own body
C. was a hereditary disease
D. was a form of malignancy
[简答题]It began to decline (衰落) about a hundred years ago, when many girls left home to go into service in town many miles away, and men also left home in increasing number in search of work, and home was where work was.
[单项选择] Passage Three
Thousands of years ago man used handy
rocks for his surgical operations. Later he used sharp bone or horn, metal
knives and, more recently, rubber and plastic. And that was where we stuck, in
surgical instrument terms, for many years. In the 1960s a new tool was
developed, one which was, first of all, to be of great practical use to the
armed forces and industry, but which was also, in time, to revolutionize the art
and science of surgery.
The tool is the laser and it is, being
used by more and more surgeons all over the world, for a very large number of
different complaints. The word laser means: Light Amplification by Stimulated
Emission of Radiation. As we all know, light is hot; any source of light--from
the sun itself down to a humble match burning--will give warmth. But light is
usually spread out over a wide area. The l
A. it is a highly intensified beam of light
B. its strength is increased by the heat of the sun
C. it can be connected to strong light sources
D. it is a concentration of light from different sources
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