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There are two dogs in my family. One is white,_____________ black.
A.a(chǎn)notherB.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.a(chǎn)nd

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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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(本小題滿分12分)
如圖,四邊形是直角梯形,∠=90°,,=1,=2,又
=1,∠=120°,,直線與直線所成的角為60°.

(Ⅰ)求證:平面⊥平面
(Ⅱ)求二面角的余弦值.

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(本小題12分)如圖,四棱錐中,
側(cè)面是邊長(zhǎng)為2的正三角形,且與底面垂直,底面的菱形,的中點(diǎn).
(1)求與底面所成角的大。
(2)求證:平面;
(3)求二面角的余弦值.

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((本小題滿分12分)
如圖,在四棱錐P—ABCD中,底面ABCD,底面為直角梯形,,AD=2,AB=BC=1,PA=
(Ⅰ)設(shè)MPD的中點(diǎn),求證:平面PAB;
(Ⅱ)若二面角B—PC—D的大小為150°,求此四棱錐的體積.

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