Exercising your brain every day is beneficial__________
A. for younger and older people
B. to the proper function of your memory
C. is called long-term memory
D. the capacity to store what you have learned
E. belongs to very long-term memory
F. the ability to remain mentally healthy
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采购人采购纳入《政府采购自主创新产品目录》中的货物和服务时,应遵循()的规定。
某投资者在5月份以4美元/盎司的价格买入1份执行价格为360美元/盎司、6月份到期的黄金看跌期货期权,以3.5美元/盎司的价格卖出1份执行价格为360美元/盎司、6月份到期的黄金看涨期货期权,以358美元/盎司的价格买入1份6月份到期的黄金期货。则在期权到期时,该投资者的净收益为()美元/盎司。