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 fight 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 crasher 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 cutter like.
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 handedness 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
更多"Passage 2
The two claws o"的相关试题:
[单项选择] Passage 2
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 fight 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 crasher 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 cutter like.
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. A left cutter like claw is removed in the fifth stage and a crusher claw develops on the right side.
B. A left cutter like claw is removed in the fourth stage and a crusher claw develops on the left side.
C. A left cutter like claw is removed in the six stage and a crusher claw develops on the right side.
D. A left cutter like claw is removed in the fourth stage and a crusher claw develops on the right side.
[单项选择] Passage Two
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
In only two decades Asian Americans
have become the fastestgrowing the U. S. minority. As their children began
moving up through the nation’s schools, it became clear that a new class of
academic achievers was emerging. Their achievements are reflected in the
nation’s best universities, where mathematics, science and engineering
departments have taken on a decidedly Asian character. This special liking for
mathematics and science is partly explained by the fact’ that Asian-American
students who began their educations abroad arrived in the U.S. with a solid
grounding in mathematics but little or no knowledge of English. They are also
influenced by the promise of a good job after college. Asians feel they will be
judged more objectively. And the return on the investment in education is more
immediate in something like engineering than
A. feel they are mistreated because of limited knowledge of English
B. are afraid that their academic successes bear a strong Asian character
C. still worry about unfair treatment in society
D. generally feel it a shame to have to depend on their parents
[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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