The best title for this passage is “————”.
A. The Influence of the Sun and Tide
B. A Discovery in Biology
C. The Fiddler Crab
D. A Living Clock
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The crab’s color-changing ability was probably developed ————.
A. in the process of evolution
B. over millions of years
C. by the work of biologists
D. both A and B
The crab’s changing color ————.
A. tells the crab what time it is
B. protects the crab from the sunlight
C. keeps the crab warm
D. is of no real use
When the fiddler crabs were kept in the dark, they ______.
A. did not change color
B. changed color more quickly
C. changed color fifty minutes later than on the day before
D. changed color on the same schedule
According to the passage,“to move as much of these goods as possible”means “_______”.
A. to sell the largest possible amount of goods
B. to transport goods as efficiently as possible
C. to dispose of these goods in large quantities
D. to redesign these goods for large-scale production
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