国际黄金价格在2013年4月12日和4月15日经历了一次震撼暴跌，直接从1550美元／盎司（约合人民币307元／克）下探到了1 321美元／盎司（约合人民币261元／克）。随后大约300吨黄金被中国大妈们以1000亿人民币抢购。导致这一现象的原因有（ ）
①黄金具有商品属性，供求关系受价格波动的影响
②黄金具有货币属性，具备避险以及保值的功能
③黄金的社会劳动生产率大幅提高
④我国民众缺乏投资需求和消费动力
| A．①③ | B．②③ | C．①④ | D．①② |
Exercise is ________ as any other to lose unwanted weight.
| A．so useful a way | B．as a useful way | C．as useful a way | D．such a useful way |
The Haiti earthquake at the beginning of 2010 is believed _______ more than 100,0130 people and makes millions homeless, ______ it perhaps the most destroying earthquake in history.
| A．to kill; making | B．to have killed; making | C．having killed; to make | D．killing; made |
Canada's economic wealth is closely linked to _______ of the US, which buys three-quarters of its exports.
| A．which | B．what | C．that | D．one |
Thanks to your help, ________ I would not have completed the task on time.
| A．however | B．because | C．so | D．otherwise |
The conflict had developed into a stage ______ the two countries were gathering big troops on the border.
| A．where | B．when | C．which | D．that |