45.According to the passage, why has general knowledge of botany declined?
(A) People no longer value plants as a useful resource .
(B) Botany is not recognized as a special branch of science.
(C) Research is unable to keep up with the increasing number of plants.
(D) Direct contact with a variety of plants has decreased.
46. In line 15, what is the author s purpose in mentioning" a rose, an apple, or an orchid"?
(A) To make the passage more poetic
(B) To cite examples of plants that are attractive
(C) To give botanical examples that most readers will recognize
(D) To illustrate the diversity of botanical life
47. According to the passage, what was the first great step toward the practice of agriculture ?
(A) The invention of agricultural implements and machinery
(B) The development of a system of names for plants
(C) The discovery of grasses that could be harvested and replanted
(D) The changing diets of early humans
48. The word "controlled" in line 19 is closest in meaning to
(A) abundant
(B) managed
(C) required
(D) advanced
49. The relationship between botany and agriculture is similar to the relationship between zoology (the
study of animals) and
(A) deer hunting
(B) bird watching
(C) sheep raising
(D) horseback riding
50. Where in the passage does the author describe the benefits people derive from plants?
(A) Line 1
(B) Lines 6-8
(C) Lines 10-11
(D) Lines 13-15
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