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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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进度计划编制的逻辑关系中，紧前工作与紧后工作可以互逆，当B工作的紧前工作有A时，A工作的紧后工作也只有B。 ()

A. 正确
B. 错误

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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

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.

进度计划编制的逻辑关系中，紧前工作与紧后工作可以互逆，当B工作的紧前工作有A时，A工作的紧后工作也只有B。 ()

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