【简答题】Suppose your university is going to host an English contest by the name of 'Green Travel'. Write a notice to 1)briefly introduce the contest, and 2)call for participants. You should write about 100 wo...
【单选题】Suppose a gardener produces both green beans and corn in her garden. If the opportunity cost of one bushel of corn is 3/5 bushel of green beans, then the opportunity cost of 1 bushel of green beans i...