题目内容

【题目】海冰是海水冻结而成的咸水冰,含盐量接近淡水。读2018年1月28日渤海及黄海北部海冰分布图,完成下列小题。

1造成图中①、④海域最大冰厚差异的主要因素是

A. 密度B. 气温

C. 水深D. 风速

2渤海海冰目前没有大规模开采的原因最有可能是

A. 冰期时间过短B. 保护海洋需要

C. 开发成本过高D. 市场需求不足

【答案】

1B

2C

【解析】

1从图中的数据分析,①、②、③、④海域自北向南海冰逐渐变薄,所以主要影响因素是纬度差异造成的温度差异,北部纬度高,气温低,海冰厚度大,南部纬度低,温度高,海冰厚度较小,所以B项正确。同位于沿海地区,海水密度、水深、风速差异不大,影响较小,所以ACD项错误。

2A项,渤海海域纬度较高,受冬季风影响,海冰覆盖面积大,结冰时间较长,故A项错误。

B项,开采海冰不会对环境造成破坏作用,故B项错误。

C项,由于技术等因素,海冰开采难度较大,开采成本较高,所以目前没有大规模开采,故C项正确。

D项,环渤海地区水资源贫乏,水资源需求量大,故D项错误。

综上所述,本题正确答案为C

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【题目】

1. Exercise

Studies show that 30minutes of mild exercise a day will increase your life span. This doesn't mean you have to run three miles or start jumping. Simple activities such as walking, gardening or taking exercise classes will work.

2. Enjoy people

Contacts with family and friends help fight life-sapping depression and stress. Studies show that people socialize regularly live longer than loners. Interact daily with family members and friends. If you are isolated, make a point of joining social clubs or church groups so you can laugh and share life's joys.

3. Stay mentally active

This is very important-use it or lose it!People who allow their mental faculties to decline run the risk of shortening their lives through falls and other injuries, and not being able to take care of themselves. Read the newspaper, visit the public library, balance your checkbook without a calculator, and exercise your brain by doing crossword puzzle.

4. Diet

The key words are"high-fiber, low-fat". Cut back on red meat, salt, white flour, white sugar, alcohol and coffee. Start eating a balanced diet including lots of fruit, grains, raw vegetables and nuts.

5. Positive attitude

By approaching life with a positive outlook you increase your chances of living longer. Stay optimistic-always search for the silver lining. Studies show people who see life as an enjoyable challenge, rather than a constant trial, cope better and prolong their life spans.

6. medication mix

As we age, we are more likely to take medications. Sometimes this leads to over-medication, which can be disabling and even deadly. Ask your doctor if the drugs you take are really necessary. Make sure there is no danger of a bad drug interaction from your medication. Used correctly, medicines can help you live longer and more comfortably.

7. Volunteer

Helping others increases your self-esteem and makes you feel like a valuable contributor.

1Which of the following does NOT increase your life span___

A.Staying happy about lifeB.Exercising as much as possible

C.Exercising your brain frequentlyD.Enjoying your social life

2People who do not stay mentally active are more likely to___.

A.become ignorantB.lose their minds

C.shorten their livesD.become slow in movement

3Which of the following is correct about medication___

A.Appropriate medication is necessary.

B.Medication is always helpful to you.

C.Doctors suggest taking expensive medicines.

D.Drugs are unnecessary because of side-effects.

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