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By saying "they employ chemical warfare" (Line 4, Para. 2), Bruce Ames means______.
A．plants produce certain chemicals to combat pests and diseases
B．plants absorb useful chemicals to promote their growth
C．farmers use man-made chemicals to dissolve the natural chemicals in plants
D．farmers use chemicals to protect plants against pests and diseases
答案
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第3题
A foreign graduate student who applies for immigrant status must have ______.
A．a U.S. employer's sponsorship.
B．financial capital to create ten jobs.
C．a job in an American company.
D．the help of an immigration lawyer.
第4题
According to paragraph 2 and 3,______.
A．people should be prepared to admit that being employed is not the only kind of work
B．people should set up smaller private enterprises so that they in turn can employ others
C．universal employment guaranteed prosperity
D．patterns of work were fundamentally unchanged despite the arrival of the industrial age
第6题
A.speaks
B.spoke
C.speaking
D.saying
第7题
Do you know ________ in English？
A.how say it
B.how to say it
C.how saying it
D.how to saying it
第8题
47_____．
[A]saying
[B]telling
[C]warning
[D]punishing
第9题
_____ the saying goes，practice makes perfect .
A.Since
B.As
C.For
D.Like
第10题
第11题
A.not to say
B.to say nothing of
C.not saying
D.saying nothing of
