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【单选题】
Suppose country A, a labor-abundant country, produces only wheat and cloth. The following equations illustrate the prices and costs of wheat and cloth in the country, where the numbers indicate the amounts of labor and land needed to produce a unit of wheat and cloth. ‘w’ is the wage rate and ‘r’ is the rental rate of land. Price of wheat = 1w + 2r Price of cloth = 2w + 1r Suppose country A engages in free trade and the price of cloth increases to $4 per unit. However, the price of wheat remains unchanged. As a result of the change in the price of cloth, the landowners are most likely to be able to:A.
purchase more of both cloth and wheat than in the absence of trade
B.
purchase more wheat but less cloth than in the absence of trade.
C.
purchase less of both cloth and wheat than in the absence of trade.
D.
purchase more cloth but less wheat than in the absence of trade
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【单选题】下列材料中属于功能高分子材料的是 [ ] ①有机玻璃②合成橡胶③高分子分离膜④生物高分子材料⑤隐身材料⑥液晶高分子材料⑦光敏高分子材料⑧智能高分子材料
A.
只有①③④⑥⑧
B.
只有②④⑥⑦⑧
C.
只有③④⑤⑥⑦⑧
D.
全部都是