关于节约，正确的说法是（）。
A.节约是一种道德要求，也是一种技术行为
B.省吃俭用是节约的本质体现
C.节约是推动创新的动力之一
D."零缺陷"产品是对资源、时间和精力的巨大节约
参考答案：A, C, D
解析：节约并非一味省吃俭用。节约既是一项道德行为，又是一项技术行为。节约的意识可以推动员工研究创新技术。"零缺陷"产品是对资源、时间和精力的巨大节约。
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 The hippopotamus, or hippo, lives in the hot part of Africa. 1 humans, dogs, and whales, it is a mammal (哺乳动物). That is, its babies are 2 alive, and they drink milk from the mother's body. The hippopotamus is a 3 grey animal with a big head and mouth. It 4 four tons, or about 4,000 kilograms. Its stomach is seven meters long, and it eats only plants. It is a mammal, but it 5 a lot of time in the water. During the 6 , it sleeps beside a river or a lake. Sometimes it wakes up. Then it goes under the water to get some 7 for food and never catches fish or hunts other animals. It can close its nose and stay 8 water for ten minutes. Its ears, eyes, and nose are high up on its head. It can stay with its body under the water and only its ears, eyes, and nose above the water. Then it can breathe the air. At night, the hippo walks on the nearby land and looks for food. It never goes very 9 the water. A baby hippo often stands on its mother's 10 -the part of the body between the neck and legs. The mother looks for food underwater. The baby rides with a sure footing on her mother above the water. | ||||
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