单项选择题

Daylight saving time was instituted to increase productivity.()

A. reorganized
B. started
C. encouraged
D. taught

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单项选择题

Life insurance, before available only to young, healthy persons, can now he obtained from old people, and even for pets.()

A. before young, healthy persons available only,
B. available only to young, healthy persons before,
C. available only to persons young, but more healthy,
D. before young and healthy persons only available to.

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