单项选择题

If 5x+ 13 = 31, what is the value of（）

A.A
B.B
C.C
D.D
E.E

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多项选择题

The author provides information that would answer which of the following questions（）

A. What factors cause change in organisms
B. What is the theory of evolution
C. How are horses' legs related to seals' flippers

单项选择题

Although there are no physical differences between the visual organs of the two groups, the inhabitants of the Bilge Islands, when shown a card displaying a spectrum of colors, perceived fewer colors than do most persons in the United States. Which of the following conclusions can most reliably be drawn from the information above（）

A、Human color perception is at least partly determined by factors other than the physical structure of the visual organs.
B、The Bilge Islanders are probably taught in childhood to recognize fewer colors than are persons in the United States.
C、Differences in social structure probably affect color perception.
D、Color perception in humans is influenced by differences in physical environment.
E、Bilge Islanders may have fewer terms denoting colors in their language than do English-speaking persons.