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不同类型的离子交换树脂需在适合pH条件下进行交换分离，当离子浓度高时，以数量取胜利，只有当浓度低时，才比较亲和力的大小。 A. 对 B. 错

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Contrary to common knowledge, the water, milk and meat of coconuts only begin the list of uses of this versatile tree. The outer husk of the ripe nuts contains fibres that, when separated, can be twisted into twine rope of amazing toughness. It is quite resistant to rot from dampness or seawater. Despite the advent of nails and screws, this rope continues to be widely used for binding together the timbers of houses and the parts of canoes, tools and the like. Expert craftsmen can make sizeable ropes, which, after use, become quite flexible. The inner shell of the ripe nut can be cut and carved into ladles, scrapers, combs and cups and will take a high polish. Furthermore, the sap of the coconut can be fermented to make a pleasant tasting wine, while the fresh sap can be used as food for babies.
 
According to the passage, twine rope __________ .
We learn from the passage that, despite the many uses of the coconut, it is ____ .
单项选择题
投资者认为未来X股票价格将下跌,但并不持有该股票。那么以下交易策略恰当的为( )。 A.
买入看涨期权 B.
卖出看涨期权 C.
卖出看跌期权 D.
备兑开仓
单项选择题
循环性缺氧导致细胞缺氧的机制是 A.
动脉氧分压降低 B.
血液氧饱和度降低 C.
单位时间内毛细血管血量减少 D.
血氧容量降低
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