题目内容
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A．unity
B．combination
C．network
D．connection
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更多“The largest system serving e-m…”相关的问题
Which is the most like cast iron?
A、A
B、B
C、C
D、none
Mercury, the planet nearest the sun, is difficult to observe from the Earth because it rises and sets within two hours of the sun. ______【46】
Planetary scientists can estimates the age of a planet's surface by the number of impact craters on it. In general, the older the surface, the more craters it has. ______【47】. Between these regions are areas of gently rolling plains that may have been smoothed by volcanic lava flows or by accumulated deposits of fine material ejected during impacts. These plains are also old enough to have accumulated a large number of impact craters. Elsewhere on the planet are smooth, flat plains that are probably younger and volcanic in origin. ______【48】. Sometime between the formation of the intercrater plains and the formation of the smooth plains, the whole planet may have shrunk as it cooled, causing the crust to buckle and form. the long, steep cliffs called scarps.
The largest impact basin on Mercury has a diameter of about 800 miles (1, 300 kilometers) and is surrounded by mountains that rise to heights of about 1. 2 miles (2 kilometers). ______【49】.
On the opposite side of the planet is an area of hilly, linear terrain that probably resulted from seismic waves caused by the same impact.
Like other airless, solid bodies in the solar system, the entire surface of Mercury is covered with a layer of rubble called regolith, which is composed of material, ranging from dust to boulders, that was scattered when impact craters were formed. This debris was in turn broken up and redistributed by subsequent impacts.
Mercury is very dense and has a magnetic field that is about 1 percent as strong as earth's. This suggests the existence of a planetary core composed of iron and nickel and constituting about 40 percent of the planet's volume. ______【50】. Radar images taken of Mercury in 1991 show what are considered to be large ice patches at the planet's North Pole.
A. Some regions on Mercury are heavily cratered, suggesting that they are very old surfaces that were probably formed about 4 billion years ago
B. The crater was probably created by the impact of a large planetesimal when Mercury was forming
C. Consequently, little was known about the planet until the Mariner 10 spacecraft made several flybys in 1974 and 1975
D. Mercury is much smaller than the Earth
E. The surface gravity is about one-third as strong as Earth's, and a thin atmosphere surrounds the planet
F. These plains have relatively few impact craters
(46)
Kohout immediately called to Graham’s wife, Evelyn, to telephone 911. Then he ran back to his house to get Terence Reif and Glenn Fajardo to help,who were at work inside the house. “There was no time for second thoughts,” said Reif，a farmer’ s son. “The only thing to do was to get in the pool.”
The car doors were locked. Graham,73, was unconscious (失去知觉)，and his Mercury was rapidly filling with water. Reif struggled to break the driver’ s side window with a hammer but had trouble getting it done underwater.
Finally—some four minutes after the car had fallen into the pool—the glass was broken. By then，Graham was floating at the top of the flooded passenger compartment (车厢).
The three men pulled Graham out through the broken glass. He wasn’ t breathing and his heart stopped beating,so they performed mouth-to-mouth resuscitation. The rescue(急救)team arrived in no time. Doctors supplied him with advanced life support on the way to the hospital.
“ These people were getting to Graham through the glass，’’ said Dr. Jeff Messinger. “ All three acted without regard for their own safety. ’’Added Evelyn Graham，“They were truly angels(天使)watching over us.” Immediately after Robert found the car sinking into the pool, he ____.
A.jumped into the pool
B.shouted to let Evelyn call the rescue team
C.ran to the nearest telephone
D.rushed into Graham’s house to find his wife
What does the word “resuscitation” refer to in the story？A.A way of saving people who have stopped breathing
B.A way of helping people who have heart trouble
C.A way of saving people who have got drunk
D.A way of helping people who need water
Which of the following would be the best title for this story？A.The Underwater Gar.
B.Angels around Us.
C.Rescue Team in Time
D.Safety First.
A、a literary and artistic movement
B、a political movement
C、a cultural movement of 1940s
D、a cultural movement of 1950s
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