9.Cactus plants have spines that prevent animals from nibbling them.
A.ruining
B.reaching
C.climbing
D.gnawing
10.There are notices to the contrary，a great deal of technical writing is at best awkward and at worst actually unclear.
A.denials
B.laws
C.attempts
D.ideas
11.The students will be notified regarding the college entrance examination.
A.condoned
B.deformed
C.emulated
D.informed
12.Even before modern notions of friction，it was known that greased surfaces move over one another more easily than dry ones.
A.concepts
B.tricks
C.benefits
D.techniques
13.Because poultry is as nutritious as beef and lower in fat，many people are beginning to include more chicken in the diets.
A.delicious
B.filling
C.common
D.nourishing
14..One of the responsibilities of the Coast Guard is to make sure that all ships obediently follow traffic rules in busy harbors.
A.skillfully
B.safely
C.dutifully
D.currently
15.In the United States there are more people who are obese today than twenty years ago.
A.gainfully employed
B.upwardly mobile
C.excessively overweight
D.privately educated
参考答案：1C 2A 3A 4C 5D 6C 7C 8C 9D 10D 11D 12A 13D 14C 15C