8. Mary while Peter the piano.

A.was dancing; was playing
B.danced; played
C.was dancing; played
D.danced; was playing

8.A

【分析】这道题考查过去进行时的用法，while连接两个过去同时发生的延续性动作，需使用过去进行时。解题思路：首先明确while的用法——while引导时间状语从句时，强调主句和从句的动作在过去某一时刻同时进行，两个动作均为延续性动作，因此都要采用过去进行时结构（was/were + 现在分词）。
【解析】句子表达“玛丽在跳舞时，彼得在弹钢琴”，两个动作“跳舞”和“弹钢琴”都是过去同时进行的延续性动作。主语Mary是第三人称单数，be动词用was，dance的现在分词是dancing；主语Peter是第三人称单数，be动词用was，play的现在分词是playing，因此两个空都需用过去进行时，对应选项A。
【答案】A
【知识点】过去进行时；while的用法
【点评】本题考查过去进行时中while连接同时进行的延续性动作的基础用法，是初中英语时态类常见题型，需掌握while的时态搭配规则。
【难度系数】0.6

三、阅读理解
Have you ever heard of the avalanche(雪崩)? The avalanche is a kind of sudden natural disaster like the earthquake. During an avalanche, a lot of snow and ice rush down the mountain. As they rush, the snow and ice move faster and faster. In fact, the snow in an avalanche can move as fast as two hundred miles an hour. That is almost three times faster than a car on the highway!
Most avalanches happen after big storms. In the mountains like the Alps and the Himalayas, there is snow and ice all year round. After big storms, new snow puts more pressure(压力) on the old snow. It can make the old snow rush down.
Avalanches are very dangerous. Heavy snow moving down the mountains may pull trees and rocks along. That can cause great damage, such as pushing over houses and killing people. Luckily, no one lives in the mountains where avalanches often happen. Not many people die from avalanches each year.
Most people who may lose their lives in avalanches are skiers(滑雪者). It's important for them to stay safe while having fun in the snowy mountains. Scientists can usually tell whether(是否) an avalanche might happen or not. If you are a skier, remember to pay attention to scientists' warnings before you go skiing.
1. Which word best describes the snow in an avalanche according to Paragraph 1?
A. Slow. B. Fast. C. Rare. D. Common.
2. What makes the old snow rush down the mountains?
A. The pressure. B. The mountain.
C. The storm. D. The ice.
3. What does the underlined word "damage" probably mean in Chinese?
A. 噩耗 B. 扫荡 C. 赔偿 D. 破坏
4. What should skiers do before going skiing according to the passage?
A. Go and talk to scientists about avalanches.
B. Learn about how to keep themselves safe.
C. Check whether there is an avalanche warning.
D. Live far away from the mountains with avalanches.
5. The writer wrote the passage mainly to .
A. teach people to stay away from avalanches
B. warn people of the possible avalanches
C. introduce a natural disaster
D. ask more people to go skiing

1.B 2.A 3.D 4.C 5.C

【分析】
1. 第1题：定位第一段关于雪崩中雪的移动速度描述，匹配选项；
2. 第2题：定位第二段导致旧雪下滑的原因，提取关键信息；
3. 第3题：根据划线词后的举例内容推测词义；
4. 第4题：定位第四段滑雪者滑雪前的注意事项，对应选项；
5. 第5题：梳理全文核心内容，归纳作者写作目的。
【解析】
1. 第1题：由第一段“In fact, the snow in an avalanche can move as fast as two hundred miles an hour.”可知雪崩中的雪移动速度很快，故选B；
2. 第2题：由第二段“After big storms, new snow puts more pressure(压力) on the old snow. It can make the old snow rush down.”可知是新雪施加的压力使旧雪下滑，故选A；
3. 第3题：划线词“damage”后举例“pushing over houses and killing people”（推倒房屋、伤人），这些属于破坏行为，故词义为“破坏”，选D；
4. 第4题：由第四段“If you are a skier, remember to pay attention to scientists' warnings before you go skiing.”可知滑雪前需关注雪崩预警，故选C；
5. 第5题：全文介绍了雪崩的定义、发生原因、危害及相关注意事项，核心是介绍这种自然灾害，故选C；
【答案】
1.B 2.A 3.D 4.C 5.C
【知识点】
阅读理解,细节理解,词义猜测
【点评】
本文是一篇科普类阅读理解，围绕雪崩展开，题目设置涵盖细节查找、词义推测和主旨归纳，考查学生的英语阅读理解能力，难度适中。
【难度系数】
0.6