(C) while there is
(D) that there are
15. Almost ______ substances expand in volume when heated and contract when cooled.
(A) all
(B) they all
(C) all of
(D) all are
16. A children''s librarian often conducts story hours and other activities to help children
A B
enjoy herself while developing an interest in reading and the library''s resources.
C D
17. Titanium has the strength of steel but weighs half only as much, hence its advantage
A B C
for use in aircraft.
D
18. Protective behaviors of amphibians include hiding in the presence of danger and
A B
having coloration such closely matching the environment that the animal is not Obvious.
C D
19. As the highest-paid star of the silent screen, earning a reputedly income of $20, 000
A B C
a week, Gloria Swanson epitomized the glamour of Hollywood in the 1920''s.
D
20. Candles may be made by repeatedly dipping wicks in tallow, by molding, nor by
A B
pouring melted wax over the wicks and rolling them into shape.
C D
21. While models of automobiles date back as far as the late 1600''s, the 1880''s seen the
A B C
first commercial interest in the vehicle.
D
22. The conceptual of musical harmony is generally traced to the ninth century because it