问题 综合

读图,分析回答下列问题。

(1)依据图示信息用“═══”分别画出经过甲、乙两处的山脉走向。

(2)图中小运河的主要作用是         

A.防洪

B.灌溉

C.旅游

D.航运(3)图示地区地势特点是________,判断依据是____________________。

(4)分析图示农业基地形成的区位优势。

答案

(1)甲处:西北到东南、乙处:东北到西南

(2)B

(3)北高南低;河流流向自北向南

(4)①地处低纬,光热资源丰富;②季风气候,降水量丰富,且水热配合好;③冲积三角洲,地势平坦、土壤肥沃;④河网密集,灌溉便利;⑤消费市场广大。

本题考查广东省级周边地区。

(1)甲附近为南岭的西端;乙附近为武夷山脉的南端。

(2)该小运河主要位于湖泊和雷州半岛之间,由于雷州半岛水源不足,故开凿运河,提供水源。

(3)结合河流流向判断。

(4)该农业基地表示珠三角,形成的主要区位优势,从自然条件:地理位置、气候、地形、土壤、水源及社会经济因素:市场、科技、政策、劳动力、交通等方面分析。

选择题
阅读理解

Children can spend hours a day looking at computer screens and other digital devices. Some eye doctors say this leads to an increase in “computer vision syndrome(电脑视力综合症).”

Nathan Bonilla-Warford is an optometrist(验光师)in Tampa, Florida. He has seen an increase in problems in children. “A lot more children come into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their nearsightedness appears to be increasing and they’re worried,” he says.

Dr. Bonilla-Warford says part of the problem is that children may be more likely to pay no attention to early warning signs than adults. “Even if their eyes start to feel uncomfortable or they start to get a headache, they’re less likely to tell their parents, because they don’t want to have the game or the computer or whatever taken away,” he explains.

He says another part of the problem is that people blink(眨眼)less often when they use digital devices. He says, “A person who uses an electronic device blinks about one third as much as we normally do in everyday life. And so that can result in the front part of the eye drying and not staying protected like normal.”

Eye doctors offer suggestions like following which is known as the 20/20/20 rule. That means every twenty minutes look away twenty feet or more for at least twenty seconds from whatever device you’re using.

Other suggestions include putting more distance between you and the device and using good lighting. Of course, another way is to spend less time looking at screens. Many experts say children should spend no more than two hours a day using digital devices—with no screen time for children under two.

But not all eye doctors have noticed an increase in problems in children. Dr. David Hunter, from Children’s Hospital Boston, has not seen an increase in his practice. “While it is possible to develop fatigue looking at screens for a long period of time, there’s certainly no proof that it actually causes any damage(伤害)to the eyes.” he says.

小题1:Which of the following is true according to the passage?

A.Dr. Bonilla-Warford thinks using computers causes nearsightedness.

B.People keep their eyes protected against drying by blinking normally.

C.Children under two can watch TV for less than two hours a day.

D.Dr. David Hunter says headache causes an increase in eye problems.小题2:What does the underlined word “fatigue” mean?

A.Interest

B.Ability

C.Tiredness.

D.Difficulty.小题3:What can be the best title for the passage?

A.Looking at Screen: Two Hours or More

B.How Can Children Use Their Eyes Properly

C.Using Digital Devices: Advantages and Disadvantages

D.How Much Screen Time Is Too Much for Children