isthatusedfor?thefloor.A．Why;T

-- _____is that used for?
---_____ the floor.

A．Why; To cleaning

B．What; Cleaning

C．Why; To clean

D．What; clean

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The fact has worried many scientists ______ the earth is becoming warmer and warmer these years.

A．what

B．which

C．that

D．though

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．He has ______ little education that he finds it impossible for him to equal ______ important a task.

A．so ;such

B．such ; so

C．so ;so

D．such ; such

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A．because

B．why

C．how

D．that

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Astronauts in a spaceship have to _______weightless conditions _______are quite different from ______are on the earth.

A．do with; which; those	B．deal with; that; that
C．solve; that; what	D．face; which; these

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— Can you answer my question?
--Sorry, I____________ . Would you repeat that question?

A．hadn’t listened

B．haven’t listened

C．don’t listen

D．wasn’t listening

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