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单选题 函数的定义域是(  ).

A

B

C

D

(其中

单选题 若tan α=2,=(  ).

A

B

5

C

-5

D

单选题 sin15ocos15o=(  ).

A

说明:HWOCRTEMP_ROC90

B

说明:HWOCRTEMP_ROC110

C

说明:HWOCRTEMP_ROC120

D

说明:HWOCRTEMP_ROC130

单选题 How many suggestions have you got from the text?

A

Two.

B

Three.

C

Four.

D

Five.

单选题 Mr. Jackson closed the fridge door so that _____.

A

he could take a photo

B

the snake couldn’t go back to the zoo

C

the snake became cool

D

he was safe from the snake

单选题 What do you think will weaken your ability to concentrate?

A

Eating a healthy breakfast.

B

Taking too much sugar.

C

Keeping your mind sharp.

D

Getting a good night’s sleep.

单选题 设sinαcosβ=1,则cos(α+β)的值为(  ).

A

0

B

1

C

±1

D

-1

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