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在设计压力容器时的设计压力是指（ ）
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Fill in the blanks with the information you have heard from passage.[音频]1) Purpose of the programs: to1and2children to appreciate nature.2) What children learn at a national park:• Learn to3different plants, flowers and trees and understand how they4the health of our environment.• Learn how to5 nature without damaging it and what they should do at home so as not to6 to nature.
The United States ________ itself to be a middle-class nation.
He appealed to all parents to ________ from violence.
The judge was a stern, ________ man.
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