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【判断题】
密封圈抗腐蚀能力强,不易老化,工作寿命长,耐磨性好,磨损后在一定程度上能自动补偿。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】The disrupted natural ecosystem has led to ______ of some species and put a lot of species in er.
【简答题】昆虫足的类型多样，蝗虫的后足为（），螳螂的前足为（），蜜蜂的后足为（）。
【单选题】We ordered that he ______ sorry to his mon, but he insisted that it ______ his fault. A. said; wasn’t B. say; wasn’t C. said; not be D. say;...
A.
said; wasn’t
B.
say; wasn’t
C.
said; not be
D.
say; not be
【简答题】昆虫胸足的类型较多，其中蜜蜂的后足为（），螳螂的前足为（），蝗虫的后足为（）。
【单选题】_ that she didn't do a good job, I don't think I am abler than her. [ ]
A.
To have said
B.
Having said
C.
To say
D.
Saying
【单选题】Evolutionary biologists believe that speciation, the formation of a new species, often begins when some kind of physical barrier arises and divides a population of a single species into separate subpo...
A.
The division of a population into subspecies.
B.
The reuniting of separated populations after they have become distinct species.
C.
The movement of a population to a new homeland.
D.
The absence of gene flow between subpopulations.
【简答题】species，strain
【单选题】There used to be a church behind the cemetery,_____________?
A.
didn ’ t there
B.
used there
C.
usedn ’ t It
D.
didn ’ t it
【单选题】There used to be a cinema here before the war, _______?
A.
usedn ' t/wasn ' t there
B.
was there
C.
used there
D.
did there
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