阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳答案。
A
Our world is full of wonders, making us feel excited and curious. Let's take a look at the following three unusual sights(景象).

() 1. What really causes red rain?
A. Tiny red plants.
B. Red clouds in the sky.
C. Red dust from deserts.
D. Special light from nature.
() 2. Which of the following could be the best title for the blank?
A. Cold winter rivers
B. Slow-moving plates
C. Dangerous round ice
D. Amazing ice circles
() 3. What do the three sights have in common?
A. They are all connected with water.
B. They all happen in desert areas.
C. They all need strong winds to form.
D. They all happen in winter.

1. C 2. D 3. A

1. 细节理解题。根据"Red rain from the sky"部分的"But now we know it's usually from red dust(灰尘) from faraway deserts mixing with rainwater"可知，红雨的实际成因是来自远方沙漠的红色灰尘和雨水混合，对应选项C。
2. 标题归纳题。第三个板块核心介绍了奇特的自然现象冰圈，且前两个小标题都点明了所介绍的奇观核心，"Amazing ice circles"既贴合板块全部内容，也和前文两处奇观描述里的"amazing"表述风格统一，对应选项D。
3. 推理判断题。乳状云的形成涉及富含水滴的空气，红雨是雨水混合红灰形成，冰圈是冰块在流动的水中被打磨成圆形，三者都和水相关。其余选项：B三者并非都发生在沙漠区域；C文中没有提及三者形成都需要强风；D乳状云和红雨都不是仅发生在冬季，均表述错误，对应选项A。