【单选题】一 Some Chinese students find it difficult to understand native speakers when in London. — Exactly, _____ they've learned a lot about grammar and known many words. [ ]
【简答题】根据新古典企业固定投资模型,在什么条件下企业发现增加自己的资本存量是有盈利的? In the neoclassical model of business fixed investment, under what conditions will firms find it profitable to add to their capital stock?