下表是我国北方某地区的部分资料，读表回答下列题
| 年份 |
森林覆盖率 |
耕地面积平方千米 |
年降水量 |
气温年较差 |
河流含沙量 |
粮食平均亩产 |
粮食总产量亿kg |
| 1985 |
19% |
333 |
520mm |
38℃ |
10% |
205kg |
1.02亿kg |
| 1995 |
10% |
478 |
450mm |
42℃ |
35% |
135kg |
0.97亿kg |
目前，该地区生态环境的最主要问题是（ ）
| A．风沙危害严重 | B．水土流失严重 |
| C．大陆性气候减弱 | D．光照条件变差 |
该主要生态环境问题导致的直接危害是（ ）
| A．易形成沙尘暴 | B．淤积河湖，加剧洪涝 |
| C．物种锐减或灭绝 | D．土地肥力上升 |
— Shall I go and buy two more bottles of beer?
— No, I’ve already bought twenty. That _____ be enough for us two.
| A．can | B．may | C．ought to | D．might |
We Chinese can work wonders, that is, we can make ____.
| A．impossible possible |
| B．the impossible possible |
| C．impossibly possible |
| D．the impossible possibly |
----So you are not spending your holiday in Wuhan this year.
---No, _______.
| A．everywhere in Wuhan |
| B．somewhere in Wuhan |
| C．somewhere but in Wuhan |
| D．anywhere but in Wuhan |
The temperature can fall to －50°C. _____ is, 50°Cbelow freezing point.
A. Which B. It C. This D. That
Since then I a member of the family and never from them.
| A．have be come; will I separate |
| B．have be come; I will separate |
| C．have been; will be separated |
| D．have been; I was separated |