消费、投资、出口被称作是拉动经济发展的“三驾马车”。2011年我国最终消费对GDP的贡献率提升至47.9%，而前几年这一比重仅为30%多一点。下列选项中，能够导致这种变化的因素有
| A．食品价格上涨，恩格尔系数提高 |
| B．贷款利率下降，企业投资积极性高涨 |
| C．人民币升值，进口贸易增加 |
| D．居民收入增加，社会保障体系完善 |
—How long does it take to get to the airport？
—Forty minutes．But it’s foggy today．I’m not sure________the highway will be closed soon．Let’s set off earlier．
| A．whether |
| B．when |
| C．how |
| D．why |
—You study________hard________you’re sure to pass the exam．
—Thank you for saying so．
| A．enough；to |
| B．as；as |
| C．so；that |
| D．such；that |
—Who broke the window？
—________．A strong wind broke it last night．
| A．Somebody |
| B．Anybody |
| C．Nobody |
| D．Everybody |
Many students said that they were willing to work hard to make their dreams________true．
| A．come |
| B．came |
| C．comes |
| D．coming |
I________football when l was a child．
| A．use to play |
| B．used to playing |
| C．used to play |
| D．used to played |