Firms face trade-offs in production, including decisions related to:
A. which products to produce.
B. how much of a particular product to produce.
C. the best way to produce a given amount of output.
D. all of the above
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威廉非常喜欢那女孩,所以他尽力讨好她,并且很有信心可以赢得她的心。(impress; optimistic)
他有创造性,对未来也有很好的判断力,可就是喜欢秘而不宣。(creative; vision; keep sth. to oneself)
他们来自一个贫穷的小山村,那里的人们远离现代文明。(shut off)
我们要努力工作,争取达到我们所订下的目标。(achieve the goals; make an/the effect)