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不定项选择
此女子剪影可判断为 三角型。
A．正确
B．错误
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相关考题
多项选择题
线性定常系统稳定的必要条件是系统特征方程的所有系数（ ）。
A、不全为零
B、同号
C、为负
D、为正
E、严格为正
F、严格为负
单项选择题
在严肃的工作会议上、高雅的音乐殿堂里骤然响起的手机声，就会受到大家的侧目，被视为极不礼貌的行为，这是协调功能在起作用。
A、正确
B、错误
问答题
Listening to a report concerning animal research from VOA Special English and fill in the missing information.
1.
PETA disapproves of the use of animals for _______________. But many research scientists say this position could prevent development of treatments and cures for serious and _______________.
2.
Wesley Smith is a lawyer allied with the Discovery Institute, a ________educational group. He has written extensively about science and _______. Mr. Smith points to the Silver Spring Monkey Case as an example of _______ policy. Last year, he wrote on the subject for the online publication of the National Review. His article was called "A Monkey for Your Grandmother."
3.
He noted the _________ of victims of Alzheimer's disease. This disease ________ mainly older people. It steals their ability to think and care for themselves. Animals are often used in research on such ______________.
4.
The American Veterinary Medical Association is an organization of doctors who care for animals. The A.V.M.A. agrees with some __________ taken by animal rights groups. But the association also says it cannot accept policies that conflict with what it calls ____________ animal use for human purposes.
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