The two claws of the mature American
lobster are decidedly different from each other. The crusher claw is short and
stout; the cutter claw is long and slender. Such bilateral asymmetry, in which
the right side of the body is, in all other respects, a mirror image of the left
side, is not unlike handedness in humans. But where the majority of humans are
right-handed, in lobsters the crusher claw appears with equal probability on
either the right side or left side of the body. Bilateral
asymmetry of the claws comes about gradually. In the juvenile fourth and fifth
stages of development, the paired claws are symmetrical and cutterlike.
Asymmetry begins to appear in the juvenile sixth stage of development, and the
paired claws further diverge toward well-defined cutter and crusher claws during
succeeding stages. An intriguing aspect A. drawing an analogy between asymmetry in lobsters and handed in humans. B. developing a method for predicating whether crusher claws in lobster will appear on the left or right side C. explaining differences between lobsters’ crusher claws and cutter claws D. discussing a possible explanation for the way bilateral asymmetry is determined in lobsters
[单项选择] Passage Two
If two scientists at Los Alamos
National Laboratory are correct, People will still be driving gasoline-powered
cars 50 years from now, giving out heat-trapping carbon dioxide into the
atmosphere--and yet that carbon dioxide will not contribute to global warming.
The scientists, F. Jeffrey Martin and William L. Kubic Jr., are proposing a
concept, which they have patriotically named Green Freedom for removing carbon
dioxide from the air and turning it back into gasoline. The idea
is simple. Air would be blown over a liquid solution which would absorb the
carbon dioxide. The carbon dioxide would then be extracted and subjected to
chemical reactions that would turn it into fuel. Although they have not yet
built a fuel factory, or even a small prototype, the scientists say it is all
based on existing technology. "Everything in the co A. It is given a patriotic name. B. No law of physics is violated. C. It is based on existing technology. D. Carbon dioxide can be converted into fuel.
[填空题] Passage Two
At two minutes to noon in September 1 of 1923, the great clock in Tokyo
stopped. (82) Tokyo Bay shook as if huge rug had been pulled from under it. (83)
Towered, above the bay, the 4000-meter Mount Fuji stood above a deep trench in
the sea. (84) It was from this trench where the earthquake came at a
magnitude of 8.3 on the Richter scale. Huge waves swept over the
city. (85) Boats were driven inland, and buildings and people were dragged
out sea. (86) The tremors dislodged part of a hillside, which gave way,
brushing trains, stations and bodies the wafer below. (87) Three massive
shocks wrecked the of Tokyo and Yokohama and, during the next six hours,
there were more than 100 aftershocks. The casualties were
enormous, but there were also some lucky survivors. (88) The most
remarkably was a woman who was having a bath in her room at the Tokyo Grand
Hotel. (89) As for the hotel collapsed, sh
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