题目内容
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The largest portion of children' s television viewing time is spent______.
A．watching weather report
B．playing games on the television set
C．watching adult programs during the evening
D．watching educational program
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The largest portion of household spending in China goes towards ______.
A．education.
B．accommodation.
C．travel.
A．its largest paintings
B．a portion of its paintings
C．paintings by American artists
D．paintings it wants to sell
A、is the largest part of vascular tunic.
B、divides the chamber of eye into anterior and posterior parts.
C、is colourless and transparent.
D、has a anterior portion called the ciliary ring.
E、contains smooth muscle fibers called ciliary muscle.
It is hard to move the Coke machine out of school because ______.
A．it always brings in money more than students' tuition
B．it is likely to cause students to become Coke addicts
C．it can never be ignored as it brings funds to school
D．it serves as the largest portion in school's business
The author implies in the tenth paragraph that
A．Americans can"t wag their fingers because carnivorous diet is unhealthy for the bones.
B．Americans don"t have the right to criticize other nations" unhealthy eating habit.
C．Americans should account for the largest portion of green house gas emission.
D．Americans prefer to eat meat because they believe that meat has more nutrition.
Like the landing on the moon, the construction of a canal across the narrow Isthmus of Panama was a dream long before it became reality. As early as 1534, Charles I of Spain proposed a canal at Panama, but it would take nearly 400 years for builders to catch up with his imagination.
When the canal finally was proposed required all the creativity the twentieth century could muster. It was the largest public work ever attempted. Its engineers had to control a wild river, cut the continental divide, construct the largest dam and man made lake known to that date and swing the largest locks ever constructed from the biggest cement structures then poured. Along the way, two of the world's most devastating diseases had to be wiped out in one of their greatest strongholds. And all of this was to be done without the airplane or the automobile: Kitty Hawk rose into the head-lines in 1903 the same year the U. S. signed a treaty with Panama——and there was no road across the isthmus until the World War Ⅱ.
If Panama has had an unusual role in bygone dreams, it most certainly has a startling relationship to the hard facts of geography. The country is farther east than most people imagine——the canal and about half of Panama actually lie east of Miami. Because of the country's shallow "S" shape and east-west orientation, it has places where the sun rises in the Pacific and sets in the Atlantic. More significantly, Panama is squeezed into the narrowest portion of Central. At the canal, just 43 miles of land separate Atlantic and Pacific shores. Perhaps even more important, Panama offers the lowest point in the North American continental divide—— originally 312 feet above sea level at the canal's Culebra Cut. By comparison, the lowest pass in the United States is nearly 5,000 feet.
In scope and difficulty, the canals construction was most closely alike to that of the ______. ()
A．Suez Canal
B．trans-Siberian Railroad
C．Taj Mahal
D．pyramids of Egypt
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