C. damage
D. detect
正确的答案是:C
7.A. protection
B. usage
C. change
D. float
正确的答案是:A
8.A. resistance
B. means
C. help
D. threat
正确的答案是:D
9.A. Who
B. While
C. Where
D. What
正确的答案是:B
10.A. many
B. much
C. little
D. few
正确的答案是:C
11.A. position
B. part
C. concern