单项选择题

The passage is primarily concerned with ______.

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
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单项选择题
Which of the following experimental results, if observed, would most clearly contradict the findings of Victor Emmet
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 fight side.
D．A left cutter like claw is removed in the fourth stage and a crusher claw develops on the right sid
单项选择题
It can be inferred from the passage that one difference between lobsters in the earlier stages of development and those in the juvenile fourth and fifth stages is that lobsters in the early stages are ______.
A．likely to be less active
B．likely to be less symmetrical
C．more likely to replace a crusher claw with a cutter claw
D．more likely to regenerate a lost claw
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