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Ⅴ. Read and choose.（阅读材料，选择正确答案。）
Dear Emma,
How are you? I just got back from school with good news. Tomorrow we are going to have the third live(现场直播的) class of the “Tiangong Class” series.
The last two live classes were very amazing. The teachers were taikonauts working in China's space station Tiangong. I got to know a lot about science in space. The taikonauts can't walk in the space station. They “fly”. Water becomes magic in space. In the first live class of the “Tiangong Class” series, the ping-pong ball didn't float(漂浮) on the water surface(表面) as it does on Earth. It stayed inside the water. Why is that? Buoyancy(浮力) arises(产生) due to gravity(重力). But in space, there is almost（几乎）no gravity. So there is almost no buoyancy. The ping-pong ball cannot float up. It is different from that on Earth.
I will tell you about the third live class of the “Tiangong Class” series next time.
Yours,
Taotao
（
A. In Taotao's school.
B. In the science museum.
C. In the space station.
（
A. There is no buoyancy on Earth.
B. Buoyancy arises due to gravity.
C. There is no gravity in space.
（
（
A. Emma's school.
B. The “Tiangong Class” series.
C. China's space station.
Dear Emma,
How are you? I just got back from school with good news. Tomorrow we are going to have the third live(现场直播的) class of the “Tiangong Class” series.
The last two live classes were very amazing. The teachers were taikonauts working in China's space station Tiangong. I got to know a lot about science in space. The taikonauts can't walk in the space station. They “fly”. Water becomes magic in space. In the first live class of the “Tiangong Class” series, the ping-pong ball didn't float(漂浮) on the water surface(表面) as it does on Earth. It stayed inside the water. Why is that? Buoyancy(浮力) arises(产生) due to gravity(重力). But in space, there is almost（几乎）no gravity. So there is almost no buoyancy. The ping-pong ball cannot float up. It is different from that on Earth.
I will tell you about the third live class of the “Tiangong Class” series next time.
Yours,
Taotao
（
C
）1. Where were the teachers of the “Tiangong Class” series?A. In Taotao's school.
B. In the science museum.
C. In the space station.
（
B
）2. What can we know about buoyancy and gravity?A. There is no buoyancy on Earth.
B. Buoyancy arises due to gravity.
C. There is no gravity in space.
（
A
）3. Where will the ping-pong ball go if you put it in the water in space?（
B
）4. What is Taotao's letter mainly(主要地) about?A. Emma's school.
B. The “Tiangong Class” series.
C. China's space station.
答案
1.C 2.B 3.A 4.B
解析
【分析】
本题为英语阅读理解题，需先通读信件内容，把握核心信息，再针对每个问题定位原文细节或分析主旨来解题：第1题定位天宫课堂老师的地点，第2题找浮力与重力的关系，第3题结合太空无浮力的特点判断乒乓球位置，第4题总结信件主要内容。
【解析】
1. 细节理解题：根据信件第二段“The teachers were taikonauts working in China's space station Tiangong.”可知，天宫课堂的老师在空间站，选C。
2. 细节理解题：根据信件第二段“Buoyancy arises due to gravity.”可知，浮力由重力产生，选B。
3. 细节理解题：根据信件第二段“In space, there is almost no gravity. So there is almost no buoyancy. The ping-pong ball cannot float up.”，太空几乎无浮力，乒乓球不会浮到水面，对应插图A，选A。
4. 主旨大意题：信件围绕“天宫课堂”系列展开，介绍了前两次课堂情况及第三次课堂的预告，选B。
【答案】
1.C 2.B 3.A 4.B
【知识点】
英语阅读理解，细节理解，主旨大意
【点评】
本题考查英语阅读的基础能力，涵盖细节信息提取和主旨归纳，题目设置贴合原文，学生通过定位原文即可解答，难度适中。
【难度系数】
0.7
本题为英语阅读理解题，需先通读信件内容，把握核心信息，再针对每个问题定位原文细节或分析主旨来解题：第1题定位天宫课堂老师的地点，第2题找浮力与重力的关系，第3题结合太空无浮力的特点判断乒乓球位置，第4题总结信件主要内容。
【解析】
1. 细节理解题：根据信件第二段“The teachers were taikonauts working in China's space station Tiangong.”可知，天宫课堂的老师在空间站，选C。
2. 细节理解题：根据信件第二段“Buoyancy arises due to gravity.”可知，浮力由重力产生，选B。
3. 细节理解题：根据信件第二段“In space, there is almost no gravity. So there is almost no buoyancy. The ping-pong ball cannot float up.”，太空几乎无浮力，乒乓球不会浮到水面，对应插图A，选A。
4. 主旨大意题：信件围绕“天宫课堂”系列展开，介绍了前两次课堂情况及第三次课堂的预告，选B。
【答案】
1.C 2.B 3.A 4.B
【知识点】
英语阅读理解，细节理解，主旨大意
【点评】
本题考查英语阅读的基础能力，涵盖细节信息提取和主旨归纳，题目设置贴合原文，学生通过定位原文即可解答，难度适中。
【难度系数】
0.7
