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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 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 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】
本题为阅读理解题，需结合信件内容及插图逐一分析各小题：
1. 第1题定位天宫课堂老师的地点，需找到信件中关于老师工作地点的描述；
2. 第2题考查浮力与重力的关系，直接提取信件中对应语句；
3. 第3题需结合信件中乒乓球在太空水中的状态描述，匹配插图；
4. 第4题需概括信件主要内容，围绕核心主题判断。
【解析】
1. 第1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，故选C。
2. 第2题：根据信件第二段“Buoyancy arises due to gravity.”可知，浮力是因为重力产生的，故选B。
3. 第3题：根据信件第二段“In the first live class... the ping-pong ball didn't float on the water surface... It stayed inside the water.”，结合插图，A选项中乒乓球在水中，符合描述，故选A。
4. 第4题：信件围绕“Tiangong Class”系列展开，介绍课堂情况、相关科学知识等，核心主题是天宫课堂系列，故选B。
【答案】
1. C 2. B 3. A 4. B
【知识点】
阅读理解细节、主旨大意
【点评】
本题考查阅读理解能力，需学生精准定位关键信息、理解主旨，同时结合插图辅助解题，难度适中，适合小学阶段学生练习。
【难度系数】
0.5
本题为阅读理解题，需结合信件内容及插图逐一分析各小题：
1. 第1题定位天宫课堂老师的地点，需找到信件中关于老师工作地点的描述；
2. 第2题考查浮力与重力的关系，直接提取信件中对应语句；
3. 第3题需结合信件中乒乓球在太空水中的状态描述，匹配插图；
4. 第4题需概括信件主要内容，围绕核心主题判断。
【解析】
1. 第1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，故选C。
2. 第2题：根据信件第二段“Buoyancy arises due to gravity.”可知，浮力是因为重力产生的，故选B。
3. 第3题：根据信件第二段“In the first live class... the ping-pong ball didn't float on the water surface... It stayed inside the water.”，结合插图，A选项中乒乓球在水中，符合描述，故选A。
4. 第4题：信件围绕“Tiangong Class”系列展开，介绍课堂情况、相关科学知识等，核心主题是天宫课堂系列，故选B。
【答案】
1. C 2. B 3. A 4. B
【知识点】
阅读理解细节、主旨大意
【点评】
本题考查阅读理解能力，需学生精准定位关键信息、理解主旨，同时结合插图辅助解题，难度适中，适合小学阶段学生练习。
【难度系数】
0.5
