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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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(As) secretary of transportation, he worked to help the (bankrupt railroads) in the northeastern (United States) (solved) their financial problems.

As
B. bankrupt railroads
C. United States
D. solved

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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

(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).

(As) secretary of transportation, he worked to help the (bankrupt railroads) in the northeastern (United States) (solved) their financial problems.

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