题目

For each blank in the following passage there arefour words or phrases marked A, B, C and D. Fill in each blank with the word orphrase that best fits the context.You don't have to be a gardener,a farmer, or a vegetarian to appreciate how much we all depend on plants. Plants1 us with food, shelter, clothing, medicine, andeven the air we breathe! Here are just some of the ways that people rely on plants,2 those native to the United States.CLEAN AIR AND WATER: Plantsare the basis of healthy ecosystems that 3 many functions, including purifying air and water.Green plants harness energy from sunlig如图所示，两个底面积不同的圆柱形容器内分别盛有深度不同的液体，已知距容器底部均为h的A、B两点的压强相等．现将实心金属球甲、乙分别浸没在左右两液体中，均无液体溢出，此时A点的压强大于B点的压强，则一定成立的是（　　）A. 甲球的质量小于乙球的质量 B. 甲球的质量大于乙球的质量C. 甲球的体积小于乙球的体积 D. 甲球的体积大于乙球的体积