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For what reason did the black walnut tree become popular during the colonial period？

A. It was used for gun stocks.
B. It was used by cabinetmakers.
C. It was used as filtering material in gas masks.
D. It provided shade during summer and nut for food.

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When the Dutch first sailed up the Hudson River 300 years ago, they discovered black walnut trees so large that the first branch was as much as 70 feet above the ground. In colonial times the black walnut became one of America's first exports, because it was highly prized by cabinetmakers. During World War I almost all natural woods of the black walnut were eliminated. Trees were harvested for gun stocks, and even the nutshells were collected to use as filtering material in gas masks.
Today, growing black walnut trees is profitable because of the demand for it. However, not every black walnut tree is necessarily valuable. It must be inspected to see if it meets certain standards. Furthermore, the roots of the black walnut tree produce a poisonous substance that will cause harm to tomatoes, potatoes, blackberries and apples.
Why is the black walnut tree so valuable7

A. Because of its hardwood and its beauty.
Because of its historic value.
C. Because of its great age.
D. Because of its great size.

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听力原文：W: There is nothing I like more than a good mystery novel when I've got some spare time.
M: I likd to read too. But I prefer non -fiction: history, social commentary and staff like that.
What does the man mean？

A. He doesn't like reading at all.
B. He has no reading preference.
C. He doesn' t have time to read.
D. He doesn't read the same kind of books as the woman.

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The sentence "It's up to you" means "You are the person who ______.

A. makes the decision
B. is responsible
C. has the right
D. is confident

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【C10】

A. For fear that
B. If
C. Though
D. Whether

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For what reason did the black walnut tree become popular during the colonial period？

A. It was used for gun stocks. B. It was used by cabinetmakers. C. It was used as filtering material in gas masks. D. It provided shade during summer and nut for food.

听力原文：W: There is nothing I like more than a good mystery novel when I've got some spare time.M: I likd to read too. But I prefer non -fiction: history, social commentary and staff like that.What does the man mean？

The sentence "It's up to you" means "You are the person who ______.

【C10】

A. It was used for gun stocks.
B. It was used by cabinetmakers.
C. It was used as filtering material in gas masks.
D. It provided shade during summer and nut for food.

听力原文：W: There is nothing I like more than a good mystery novel when I've got some spare time.
M: I likd to read too. But I prefer non -fiction: history, social commentary and staff like that.
What does the man mean？