题目内容

【题目】读我国北方某地区部分资料统计表(下表),完成下列问题。

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

2000

19%

333

520mm

38℃

10%

205kg

1.02亿kg

2010

10%

478

450mm

42℃

35%

135kg

0.97亿kg

【1】在此时期内,导致该地区粮食平均亩产下降的主要原因是

A.退耕还牧的面积增大 B.毁林开荒现象严重

C.气候发生异常,每年出现水旱灾害 D.人口增长过快

【2】目前,该地区主要的生态环境问题是

A.水土流失严重 B.岩层下陷严重 C.风沙危害严重 D.石漠化严重

【答案】

【1】B

【2】A

【解析】

试题分析:

【1】根据表格信息,在此时期内,该地区森林覆盖率下降,导致水土流失,土壤肥力下降。导致粮食平均亩产下降的主要原因是毁林开荒现象严重,B对,A错。气候变化不大,降水减少,每年出现水灾减少,C错。人口增长过快不是亩产下降的直接原因,D错。

【2】结合前面分析,由于植被破坏,目前,该地区主要的生态环境问题是水土流失严重,A对。不能体现岩层下陷问题,B错。风沙危害可能严重,材料不能体现,C错。土地红漠化主要出现在江南地区,D错。

练习册系列答案
相关题目

【题目】根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Many of us are so busy with work, school and home life that often there is no time left over to do something that you enjoy. What follows are some ways to carve out that essential time you need to slow down, enjoy life and relax yourself.

Evenings with yourself. 1 If others ask you to do things those nights, just tell them you have plans. Use the time for gardening, reading, exercise, thinking or the ultimate luxury of doing nothing !

Monthly treat. Schedule a treat for yourself once a month. 2 Maybe you get a spa treatment, go to see a movie, a haircut, play golf or whatever treat you're always thinking about but rarely get to. Schedule it in and it will happen!

3 Sports, theater, concerts or any other event you would enjoy. Schedule the plans with a friend later. Having the tickets already in hand will force you to make it happen!

Leave work on time. Huh? 4 If this is you, make it a point to leave work exactly on time at least once a week, if not more. And then enjoy that time! Leave work at work.

Join a group. Here are some ideas of groups that can allow you some time away from work and home: singing group, gardening group, astronomy society, book club, biking club, ski club, etc. What are you interested in? Strike while the iron is hot. 5 If you can't find a club, consider starting one yourself!

A. It could be on your lnch break, a weekend or it could be leaving work early.

B. Don’t ignore your friends.

C. Look up a club in your area today and join!

D. Buy tickets in advance.

E. Try to save certain weeknights just for you.

F. It is suggested that you join as many groups as possible.

G. Yes, many of us stay at work late on a regular basis.

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网