26. A fever is caused which blood cells release proteins called pyrogens, raising the body's temperature.
A B C D
27. Because of various gift-giving holidays, most stores clothing in the United Sates do almost as much
A B
business in November and December as they do in the other ten months combined.
C D
28.The United States National Labor Relations Board is authorized to investigation allegations of unfair
A B
labor practices on the part of either employers or employees.
C D
29.The Great Potato Famine in Ireland in the 1840's caused an unprecedented numbers of people from
A B C
Ireland to immigrate to the United States.
D
30.The particles comprising a given cloud are continually changing, as new ones are added while others
A B
are taking away by moving air.
C D
31.Political parties in the United States help to coordinate the campaigns of their members and organizes A B C
the statewide and national conventions that mark election years.
D
32.The lemur is an unusual animal belonging to the same order than monkey's and apes.
A B C D
33.Chese may be hard or soft, depending on the amount of water left into it and the character of
A B C D
the cuting.
34.The carbon-are lamp, a very bright electric lamp used for spotlights, consists of two carbon
A B
electrodes with a high-current are passing between it.
C D
35. At first the poems of E.E. Cummings gained notoriety to their idiosyncratic punctuation and
A B
typography, but they have gradually been recognized for their lyric power as well.
C D
36.The mechanism of human thought and recall, a subject only partly understood by scientists, is
A B C
extraordinary complicated.
D
37.While the process of photosynthesis in green plants, light energy is captured and used
A B
to convert water, carbon dioxide, and minerals into oxygen and organic compounds.
C D
38.The globe artichoke was known as a delicacy at least 2,500 years ago, and records of its
A B C
cultivation date from fifteenth century.
D
39. Humans do not constitute the only species endowed with intelligence: the higher animals also
A B C
have considerably problem-solving abilities.
D
40. Many of species of milkweed are among the most dangerous of poisonous plants, while others
A B C
have little, if any, toxicity.