The aulhor suggests that melanin _______ .
A.is necessary for the production of vitamin D
B.is beneficial in sunless climates
C.helps protect fair-skinned people
D.is a synthetic product

The word “horny” in paragraph 1 is closest in meaning to __________ .
A.firm
B.strong
C.tough
D.dense

According to the passage, men who do body-building __________ .
A.appear like sculpture
B.change their appearance
C.belong to strange cults
D.are very fashionable

What does the passage mainly discuss?
A.How the principles of use and disuse change people’s concepts of themselves.
B.The way in which people change themselves to conform to fashion.
C.The changes that occur according to the principle of use and disuse.
D.The effects of the sun on the principle of use and disuse.

The word “Those” in paragraph 1 refers to _________ .
A.Organisms
B.Bodies
C.Parts
D.Muscles

_________ (50)
A.position
B.space
C.spot
D.place

_________ (49)
A.turn
B.fact
C.order
D.intention

_________ (46)
A.spread
B.appeared
C.was
D.occurred

_________ (45)
A.new
B.trendy
C.modern
D.fashionable

_________ (43)
A.distance
B.area
C.length
D.earth