A. was difficult to collect
B. came in a variety of forms
C. was difficult to get rid of
D. tended to be absorbed by physical objects
A.paid
B.took
C.spent
D.cost
A.in
B.on
C.for
D.to
A.Had they
B.Have they
C.Would they have
D.If they
A.pull out
B.run out
C.pick out
D.turn out
A.walking
B.to walk
C.walk
D.walked
A.as soon as
B.as long as
C.as far as
D.as much as
A.didn't keep
B.have not kept
C.don't keep
D.had not kept
A. man never made sounds
B. man made animal sounds
C. man used to be like animals to make sounds
D. man learned from the animals to make sounds
A. 150
B. 1,500
C. 5,000
D. ,000
A. To tell how "high tech" and "state of the art" have developed.
B. To give examples of "high tech".
C. To tell what "high tech" and "state of the art " are.
D. To describe very modem technology.
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