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A．painted onB．being painted onC．painted inD．being painted in

A. painted on
B. being painted on
C. painted in
D. being painted in

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A．in pointB．to pointC．by pointD．on point

A. in point
B. to point
C. by point
D. on point

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(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioaetive carbon (present) in the object (is examined).

A. The age of
B. be estimated
C. present
D. is examined

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In this piece of Writing the author mainly intends to ______.

A. teach people a moral lesson
B. show people the way to success in business
C. advertise a special product
D. describe the side-effects of chemotherapy for cancer

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Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height).

A. in size
B. from small rock barriers to
C. many feet
D. height

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A．painted onB．being painted onC．painted inD．being painted in

A. painted on B. being painted on C. painted in D. being painted in

A．in pointB．to pointC．by pointD．on point

(The age of) a geological sample can (be estimated) from the ratio of radioactive to nonradioaetive carbon (present) in the object (is examined).

In this piece of Writing the author mainly intends to ______.

Dams vary (in size) (from small rock barriers to) concrete structures (many feet) (height).

A. painted on
B. being painted on
C. painted in
D. being painted in