问题 综合

该图是我国局部地区某月地面天气形势图,读图回答下列问题。(8分)

(1)此图最有可能是_______月(1或7)的地面天气形势图。就气流状况而言,A地受___________控制,B地区气流运动以__________为主(上升或下沉)。

(2)近日,将有__________锋从E地过境。C地在锋面过境时,天气将会出现的变化是_______   __________,C地在锋面过境后,天气将会出现的变化是_______   __________

(3)暖空气在锋面上常有大规模的上升运动。在C、D两地的暖空气被迫抬升的是_____________地。

(4)此时,M地的风向为_________风。

答案

小题1:1月(1′) ; 反气旋(1′); 上升(1′)

小题2:暖锋(1′)    

阴天、刮风、下雨(雪)、降温(1′)

气压升高、气温降低、湿度降低、天气转晴(1′)

小题3:C (1′)  

小题4:偏北风(西北风)(1′)

题目分析:

小题1:图示亚欧大陆上被高压控制,故判断为北半球冬季。图示A处中心气压较四周高,故判断为高压中心,从气流状况看为反气旋。B地中心气压较四周低,判断为低压(气旋),垂直方向上盛行上升气流。

小题2:图示E附近有暖锋即将向E处移来。而C处为冷锋即将过境,将出现阴天、刮风、降雨、降温天气。冷锋过境后,则受冷气团控制,气温下降,气压升高,天气转晴。

小题3:暖锋为暖气团主动进攻,而冷锋为冷气团主动进攻,则暖气团被迫抬升。

小题4:直接根据图示的气压高低分布,水平气压梯度力垂直于等压线,由高压指向低压;地转偏向力北半球向右偏,风向斜穿等压线,画出M地的风向即可。

点评:本题难度不大,属于基础性试题,学生应在平时的学习中加强对基础知识点的落实,解题的关键是能从图示的等压线分布判断锋面性质和天气变化特征、风向等内容。

单项选择题
单项选择题

Most plants can make their own food from sunlight, (1) some have discovered that stealing is an easier way to live. Thousands of plant species get by (2) photosynthesizing, and over 400 of these species seem to live by pilfering sugars from an underground (3) of fungi(真菌). But in (4) a handful of these plants has this modus operandi been traced to a relatively obscure fungus. To find out how (5) are (6) , mycologist Martin Bidartondo of the University of California at Berkeley and his team looked in their roots. What they found were (7) of a common type of fungus, so (8) that it is found in nearly 70 percent of all plants. The presence of this common fungus in these plants not only (9) at how they survive, says Bidartondo, but also suggests that many ordinary plants might prosper from a little looting, too.

Plants have (10) relations to get what they need to survive. Normal, (11) plants can make their own carbohydrates through photosynthesis, but they still need minerals. Most plants have (12) a symbiotic relationship with a (13) network of what are called my corrhizal fungi, which lies beneath the forest (14) . The fungi help green plants absorb minerals through their roots, and (15) , the plants normally (16) the fungi with sugars, or carbon with a number of plants sharing the same fungal web, it was perhaps (17) that a few cheaters—dubbed epiparasites—would evolve to beat the system. (18) , these plants reversed the flow of carbon, (19) it into their roots from the fungi (20) releasing it as "payment.\

1()

A.but

B.if

C.because

D.though