...but for making money, his pen would prove mightier than his pickax ._________
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【单选题】The production quota of 20 acupuncture treatments creates deadweight loss because there are ________ additional transactions that people would like to make but would not take place given the quota.
【简答题】We do not know exactly how many whales there are in the sea because we can’t count them. But we believe at the beginning of the eighth century there were 105,000 humpback whales and 120,000 right ...