306. When disturbed, a sea anemone retracts its tentacles and shortens its body so that it resembles a lump on a rock.
The word "retracts" is closest in meaning to which of following?
(A) pulls back
(B) relaxes
(C) reproduces
(D) lifts up
307. The first such attempt, the ambitious Project Mohole, got under way during the 1960's and proved the value of deep-sea drilling by making several test holes in the mantle beneath the crust before spiraling costs led toits cancellation.
The word "spiraling" is closest in meaning to which of following?
(A) rising
(B) necessary
(C) unpredictable
(D) circular
308. Soon afterward, however, work began on the more modest Deep Sea Drilling Project, which is not aimed at reaching the mantle but at exploring the crust itself.
The expression "more modest " is closest in meaning to which of following?
(A) more sophisticated
(B) more timid
(C) less ambitious
(D) less controversial
309. This venture uses a special ship, the Glomar Challenger, which can be held precisely in position in the sea --- without any anchor --- by sound-wave guiding systems and computer-controlled propellers.
The word " precisely" is closest in meaning to which of following?
(A) exactly
(B) clearly
(C) economically
(D) practically
310. Throughout the colonial period there was a marked shortage of women, which varied with the regions and was always greatest in the frontier areas.
The word "marked" is closest in meaning to which of following?
(A) underlined
(B) graded
(C) prolonged
(D) distinct
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