The sheer diversity of tropical plants represents a seemingly ______ source of raw materials, of which only a few have been utilized.
A. exploited
B. quantifiable
C. inexhaustible
D. remarkable
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Texas, the second largest state of America, is ______ in natural resources.
A. wealthy
B. scattered
C. abundant
D. deposited
Have you anything to say ______ the proposal of taking immediate actions
A. with regard to
B. on behalf of
C. in contrast to
D. for the purpose of
Social tensions among adult factions can be ______ by politics, but adolescents and children have no such ______ for resolving their conflict with the exclusive world of adults.
A. intensified
B. complicated
C. adjusted
D. revealed
Although ancient tools were ______ preserved, enough have survived to allow us to demonstrate an occasionally interrupted but generally ______ progress through prehistory.
A. partially
B. unwittingly
C. rarely
D. needlessly