(A) differences

　　(B) sides

　　(C) activities

　　(D) studies

　　070. Plants are subject to attack and infection by a remarkable variety of symbiotic species and have evolved a diverse array of mechanisms designed to frustrate the potential colonists.

　　The phrase "subject to" is closest in meaning to which of following?

　　(A) susceptible to

　　(B) classified by

　　(C) attractive to

　　(D) strengthened by

　　071. The external surfaces of plants, in addition to being covered by an epidermis and a waxy cuticle, often carry spiky hairs known as trichomes, which either prevent feeding by insects or may even puncture and kill insect larvae.

　　The word "puncture" is closest in meaning to which of following?

　　(A) pierce

　　(B) pinch

　　(C) surround

　　(D) cover

　　072. Orchids are unique in having the most highly developed of all blossoms, in which the usual male and female reproductive organs are fused in a single structure called the column.

　　The word "fused" is closest in meaning to which of following?

　　(A) combined

　　(B) hidden

　　(C) fertilized

　　(D) produced

　　073. To lure their pollinators from afar, orchids use appropriately intriguing shapes, colors, and scents. At least 50 different aromatic compounds have been analyzed in the orchid family, each blended to attract one, or at most a few, species of insects or birds.

　　The word "lure" is closest in meaning to which of following?

　　(A) attract

　　(B) recognize

　　(C) follow

　　(D) help

　　074. Once the right insect has been attracted, some orchids present all sorts of one-way obstacle courses to make sure it does not leave until pollen has been accurately placed or removed.

　　The word "placed" is closest in meaning to which of following?

　　(A) estimated

　　(B) measured

　　(C) deposited

　　(D) identified

　　075. By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.

　　The word "discrete" is closest in meaning to which of following?

　　(A) complicated

　　(B) separate

　　(C) inoffensive

　　(D) functional

　　076. The public school system suddenly found itself overtaxed. While the number of schoolchildren rose because of wartime and postwar conditions, these same conditions made the schools even less prepared to cope with the flood.

　　The word "overtaxed" is closest in meaning to which of following?

　　(A) well prepared

　　(B) plentifully supplied

　　(C) heavily burdened

　　(D) charged too much

　　077. Therefore, in the 1950's and 1960's, the baby boom hit an antiquated and inadequate school system. Consequently, the "custodial rhetoric" of the 1930's and early 1940's no longer made sense; that is, keeping youths aged sixteen and older out of the labor market by keeping them in school could no longer be a high priority for an institution unable to find space and staff to teach younger children aged five to sixteen.