16. Twenty to thirty year after a mature forest is cleared away, a nearly impenetrable thicket
______________________
A BC
of trees and shrubs develops.
______
D
17. The first national park in world, Yellowstone Natinna1Park, was established in 1872.
____________ _____
ABCD
18.Because it does not have a blood supply, the cornea lakes their oxygen directly from
______ _____ _________
ABCD
the air.
19. Magnificent mountains and coastal scenery is British Columbia s chief tourist
________________
A BC D
attractions.
20. Scientists at universities are often more involved in theoretical research than in
________ ____ ______
A BC
practically research.
_______
D
21. John Rosamond Johnson he composed numerous songs, including Lift Every Voice
__________ __________
A B C
and Sing, for which his brother, James Weldon Johnson, wrote the words.
_______
D
22. Nylon, a synthetic done from a combination of water, air, and a by-product of coal,
____ ______________
ABC
was first introduced in 1938.
________
D
23. Ornithology, the study of birds, is one of the major scientific fields in which amateurs
________
A B
play a role in accumulating, researching, and publish data.
___ _____
CD
24. Animation is a technique for creativity the illusion of life in inanimate things.
_____________ ________
A B C D
25. The nonviolent protest advocated by Dr. Martin Luther King, Jr., proving highly
________
AB
effective in age of expanding television news coverage.
_______ _______
CD
26. On December 7,1787, Delaware became a first stale to ratify the Constitution .
__
_____ _ ______
ABC D
27. Nutritionists believe what diet affects how one feels physically and emotionally.
_________ ___ __________
AB CD