单项选择题

单项选择题 DDT, the most powerful pesticide the world has ever known, exposed nature‘s vulnerability.Unlike most pesticides, whose effectiveness is limited to destroy one or two types of insects, DDT is capable of killing hundreds of different kinds at once.（）

A.has ever known
B.whose effectiveness is
C.limited to destroy
D.is capable of killing

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单项选择题
Dr. ELBaradei said his hope is that the Nobel Peace Prize will serve to help the international community, and to achieve the goal of developing a functional system of global security that does not derive from a nuclear weapons deterrent, would rather based on addressing the security concerns of all people.（）

A.serve to help
B.derive from
C.a nuclear weapons deterrent
D.would rather
单项选择题
The trend to empty a library is being driven, academicians and librarians say, by the dwindling need for undergraduate libraries, many of them were built when leading research libraries were reserved for graduate students and faculty.（）

A.empty a library
B.driven
C.dwindling
D.many of them
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