单项选择题
()是指利用资产定价的偏差、价格联系的失常或者市场缺乏有效性等条件，通过买进价格被低估的证券，同时卖出价格被高估的证券来获得收益的交易行为。
未知题型 Our textbooks are very different from theirs.英译汉
未知题型 She likes to help any one who is in difficulty.英译汉
未知题型 The doctor had no choice but reach out to their colleagues across the nation.英译汉
