中间需求率指各产业对某产业产品的中间需求之和，与整个国民经济对该产业部门产品的总需求之比。()
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Which of the following statements is true？
A. People don't change positions when they are sleeping.
B. A person who sleeps on his stomach is very stubborn and ambitious.
C. A person who sleeps on his side is always anxious and depressed.
D. A person who sleeps curled up is not very sociable (随和的，好交往的).
经济学家克拉克是主导产业理论研究的先驱者。()
A. 正确
B. 错误
Science museums encourage visitors to touch, listen and operate in order to ______.
A. find out scientific rules for themselves
B. make them feel relaxed
C. make them interested in science
D. all of the above
在纵向关系中，上下游企业的双重加价不会造成效率损失。()
A. 正确
B. 错误
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