题目

在理论上不能用于设计成原电池的化学反应是( ) A.HCl(aq)+NaOH(aq)NaCl(aq)+H2O(l) ΔH＜0 B.2CH3OH(l)+3O2(g)2CO2(g)+4H2O(l) ΔH＜0 C.4Fe(OH)2(s)+2H2O(l)+O2(g)4Fe(OH)3(s) ΔH＜0 D.2H2(g)+O2(g)2H2O(l) ΔH＜0 答案：A 解析:能够构成原电池必须是氧化还原反应。B、C、D均为氧化还原反应，而A是复分解反应。故只有A不能构成原电池。 Many parents see business ownership as a better bet for their kids' future than a graduate degree. Some parents described it as the opportunity to control their fortunes and have a chance to get wealth.【1】. In fact, setting a child up in business is surely one big test of that bond. It is probably risky: small-business failures are common, and parents risk losing their entire investment, their life savings, or more. They also risk having their relationships with young- adult children intent at this stage on independence.【2】. Jon Kelecy's father set him up recently in a franchise (加盟店). Jon, 26, loves the work and appreciates his dad's support. But he dislikes "being in his father's pocket" in spite of all the anxiety of a start-up.Many parents choose franchises for their kids because they seem to offer marketing, branding and management support.【3】. One mother lost $250, 000 when a fast-food franchise she purchased for her son filed, Mr. Bundy says. In another case, parents lost 8350.000 on a coffee-shop business they financed for their daughter.【4】. “As a parent, the best git you can ever receive is to see your children happy and successful, and equipped to make a living," Marvin Himel says.【5】. Some structured it as a loan and delayed repayment. Others took stock in the business, with an agreement that their child would use future earnings to buy it back. Some parents look farther ahead, hoping their children's business will support them in retirement.A.I's hard for children to make a choiceB.A few viewed it as a long-term investmentC.The setups can be stressful for young adults, tooD.But start-up business costs quite a lot, and has high risksE.Parents often say they would do anything for their childrenF.Children are eager to get support from their parents in managementG.For some parents, however, the potential rewards seem worth all the risk