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There are two dogs in my family. One is white,_____________ black.
A.anotherB.othersC.the otherD.other

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—________ you open the window, please?
—Yes, I can.
A.MayB.NeedC.MustD.Can

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— Tomorrow is Saturday, why don’t we play basketball in the gym?
—Good idea, ________ I have to see my grandparents.
A.soB.orC.butD.and

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—Peter, what’s your mother doing now?
—She____________in the kitchen.
A.cooksB.is cookingC.will cookD.cooked

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We won’t go to the park if it   ________ tomorrow.
A.rainsB.has rainsC.rainedD.will rain

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They decided ______ for the children in Yunnan earthquake area.
A.do somethingB.to do somethingC.doing anythingD.done anything

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I love my hometown and I _______ here for 15 years.
A.was livingB.liveC.will liveD.have lived

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(本小题满分12分)
如图,四边形是直角梯形,∠=90°,=1,=2,又
=1,∠=120°,,直线与直线所成的角为60°.

(Ⅰ)求证:平面⊥平面
(Ⅱ)求二面角的余弦值.

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(本小题12分)如图,四棱锥中,
侧面是边长为2的正三角形,且与底面垂直,底面的菱形,的中点.
(1)求与底面所成角的大小;
(2)求证:平面
(3)求二面角的余弦值.

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((本小题满分12分)
如图,在四棱锥P—ABCD中,底面ABCD,底面为直角梯形,AD=2,AB=BC=1,PA=
(Ⅰ)设MPD的中点,求证:平面PAB
(Ⅱ)若二面角B—PC—D的大小为150°,求此四棱锥的体积.

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