单项选择题

We must try to（）the best of our moral values for our children and grand-children

A. replace
B. remain
C. generate
D. preserve

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单项选择题
In the flint decades of the twentieth century, the individual gem could not be seen, but could be worked with fruitfully（）

A. blindly
B. completely
C. productively
D. carefully
单项选择题
An area of rich forests was （）to life.

A. advantageous
B. decorative
C. attracted
D. privileged
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