A B
barrier to east-west trade in British Columbia.
C D
32.Telescope are frequently used in astronomy to collect light from a celestial object,
A B
bring the light into focus, and producing a magnified image.
C D
33.Diamond is the hardest known substance, so diamond can be cut only by another
A B C D
diamonds.
34.There are about 350 species and subspecies of birds in danger of become extinct,
A B
with a large number of them, 117 in all, found on oceanic islands.
C D
35.The nineteenth-century romantic movement in art was partially a reaction to what
A B C
was perceived as overemphasis on reasonable and order in neoclassicism.
D
36.Like triglycerides, cholesterol is a type of fat that is both consumed in the diet but
A B C D
manufactured by the body.
37.Both the United States silver dollar and half-dollar, first minted in 1794, had a figure
A B C
of Liberty on one side and a eagle on the reverse side.
D
38.For an advertisement to be effective, its production and placement must to be based
A B C
on a knowledge of human nature and a skilled use of the media.
D
39.While photosynthesis in green plants, light energy is captured and used to convert
A B C
water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
D
40.The Democratic Party, the most oldest existing political party in the United States,
A B
has played a vital role in the nation’s history.
C D