1)New oceanic crust is formed along one or more margins of each plate by material issuing from deeper layers of the Earth's crust， for example， by volcanic eruptions of lava at midocean ridges.
The word "margins" is closest in meaning to which of following?
(A) edges (B) peaks (C) interiors (D) distances
2)If at such a spreading contact the two plates support continents， a rift is formed that will gradually widen and become flooded by the sea. The Atlantic Ocean formed like this as the American and Afro-European plates move in opposite directions.
The word "support" is closest in meaning to which of following?
(A) separate (B) create (C) reduce (D) hold
3)Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity， the number of species in a particular ecosystem， to the health of the Earth and human well-being.
The word "appreciation" is closest in meaning to which of following?
(A) ignorance (B) recognition (C) tolerance (D) forgiveness
4)An alien exploring Earth would probably give priority to the planet's dominant， most-distinctive feature-the ocean. Humans have a bias toward land that sometimes gets in the way of truly examining global issues.
The word "bias" is closest in meaning to which of following?
(A) concern (B) disadvantage (C) attitude (D) prejudice
5)The prevailing winds in the Great Basin are from the west. Warm， moist air from the Pacific Ocean is forced upward as it crosses the Sierra Nevada.
The word "prevailing" is closest in meaning to which of following?
(A) most frequent (B) occasional (C) gentle (D) most dangerous
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