20) Suppose the consumption equation is represented by the following: C = 250 + .75YD, then private savings is A. -250+0.75YD. B. -1000+0.75YD. C. -1000+0.25YD. D. -250+0.25YD.
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【单选题】__________ he got up early, he _________ the early bus. [ ]
【简答题】根据汉语完成句子。 1. We got up early____(以便能赶上)catch the first bus. 2.We got up early (结果赶上了)the first bus. 3. The problem is____difficult nobody can wor it out. 这道题太难,没有一个人能解出来.