问题 选择题

表为三地连续两日日出与日落时刻(北京时间)。据此回答问题。

时间当 日次 日
日出日落日出日落
9:0023:008:5823:02
7:1918:417:2018:40
5:4018:485:3918:49
小题1:三地按纬度由高到低排列正确的是

A.①②③

B.①③②

C.②①③

D.③①②小题2:若③地为北京,则此时

A.北极圈内极昼的范围逐渐扩大

B.地球公转速度逐渐加快

C.太阳直射点位于南半球且向北移动

D.各地昼夜长短相差最小

答案

小题1:B

小题2:A

本题考查昼夜长短的应用。

小题1:根据日出、日落时间计算出①②③三地在当日的昼长分别为14小时、11小时22分、13小时8分,在次日的昼长分别为14小时4分、11小时20分、13小时10分,根据纬度越高昼夜长短差距越大的原理,可知,三地按纬度由高到低排列是①③②。

小题2:若③地为北京,③地在当日的昼长为13小时8分,次日昼长13小时10分,北京昼长夜短,且昼变长,说明太阳直射在北半球,且太阳直射点向北移,地球公转速度逐渐减慢,北极圈内极昼的范围逐渐扩大,各地昼夜长短相差不是最小。

补全对话,情景问答
阅读理解

For all dinner tables, a glass of milk seems to be a must. At least it was when I was growing up. It is widely believed that milk is a must in building strong bones and teeth. There’s no doubt that dairy products, especially milk, are high in protein and calcium, and Vitamin D and Vitamin A are added to most milk products.

While it’s well known that our bones need calcium, some studies suggest that high calcium intake doesn’t necessarily lower a person’s risk for fractures(骨折). A Harvard study found that people who drank two or more glasses of milk had no greater protection from breaking a bone than those who drank a glass or less a week.

There is no doubt that we need calcium. Some anti-dairy supporters claim dairy products can lead to heart disease. Much of this claim is based on high-fat dairy products, like cheese and cream, which may indeed lead to some health problems. Some studies have linked high milk intakes with a risk of prostate cancer; this seems also to be caused by high-fat dairy products, but not by dairy products in general.

Although milk has always been regarded as the most important thing we need for our bones, one of the most important things in strengthening bones and reducing the risk of osteoporosis(骨质疏松)is weight-bearing exercise, such as jogging, walking, and weight lifting.

Perhaps we should think of dairy products as less like a nutrient and more like a food. If you like it, eat it. If not, find something else to eat. Some claims may not be completely true. When I eat cream, I’m not thinking about calcium, protein, or any such thing. I’m thinking it is delicious.

小题1:What is the best title for this passage?

A.Milk: is it really necessary for children?

B.The disadvantages of drinking milk.

C.Milk causes health problems.

D.Milk: is it really good for the body?小题2:For people who want to reduce the risk of osteoporosis, we can infer that the writer may suggest that they ________.

A.avoid milk with Vitamin D and Vitamin A added

B.spend some time exercising

C.take in as much calcium as possible

D.drink more than two glasses of milk every day小题3:Based on the passage, we learn the writer may agree that ________.

A.milk is the most important thing that we need for our bones

B.children should not be permitted to eat cream

C.milk should be considered more like a food than a nutrient

D.children should drink milk whether they like it or not小题4:What can we learn from the passage?

A.Some dairy products may harm our health.

B.Milk has the highest level of protein of any food.

C.The writer seldom drank milk when he was young

D.People who drink milk every day are at a high risk of getting a heart disease.