单项选择题

No adults would like to admit that they are weaker than children to solve sticky and puzzling problems.()

A. to solve about
B. solve
C. in solving about
D. in solving

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单项选择题
The author refers to the ocean bottom as a frontier in Paragraph 1 because it().

A. is not a popular area for scientific research
B. contains a wide variety of life forms
C. attracts courageous explorers
D. is an unknown territory
单项选择题
Whenever we hear of a natural disaster, we feel sympathetic to the people to be affected.()

A. to have affected
B. to have effected
C. who have been effected
D. who have been affected
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