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方程2x2-y2=1表示的二次曲面是 A.球面B.柱面C.旋转抛物面D.圆锥面
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方程2x2-y2=1表示的二次曲面是 A.球面B.柱面C.旋转抛物面D.圆锥面

方程2x2-y2=1表示的二次曲面是

A.球面

B.柱面

C.旋转抛物面

D.圆锥面

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第1题

Look! The house's ________ fire. Let's get some help.A.been caughtB.catchingC.caughtD.been

Look! The house's ________ fire. Let's get some help.

A.been caught

B.catching

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第2题

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第3题

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What do homeowners do before hiring a house-sitter?

A.Interview the house-sitter and look at his or her references.

B.Interview the house-sitter' s friends.

C.Look at the house-sitter' s transcripts.

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第4题

Before he arrived at the farmer's house, the writer expected to see Milly lying_______?A.o

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A.on the floor of a room

B.on the ground of a barn

C.in bed in a barn

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第5题

before he arrived at the farmer's house, the writer expected to see Milly lying ______.A.o

before he arrived at the farmer's house, the writer expected to see Milly lying ______.

A.on the floor of a room

B.on the ground of a barn

C.in bed in a barn

D.in bed in a room

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第6题

before he arrived at the farmer’s house, the writer expected to see Milly lying ______.A.o

before he arrived at the farmer’s house, the writer expected to see Milly lying ______.

A.on the floor of a room

B.on the ground of a barn

C.in bed in a barn

D.in bed in a room

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第7题

A.They look at a house sitter's score report.B.They interview a house sitter's friends

A.They look at a house sitter's score report.

B.They interview a house sitter's friends.

C.They check a house sitter's references.

D.They attend a house sitter's party.

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第8题

A.They look at a house sitter's score report.B.They interview a house sitter's friends

A.They look at a house sitter's score report.

B.They interview a house sitter's friends.

C.They check a house sitter's references.

D.They attend a house sitter's party.

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第9题

He get a 10%______on every house he sells.A.wageB.commisionC.compensationD.revenue

He get a 10%______on every house he sells.

A.wage

B.commision

C.compensation

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第10题

went的原形
给下列的过去分词选择相应的原形。
(    ) 1. did 

(    ) 2. went 

(    ) 3. saw 

(    ) 4. broke

A. see 

B. do 

C. go 

D. break                                                                                 

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