Ⅲ. 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
(
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.
解析：
【分析】
1. 第1题：需定位原文中关于“天宫课堂系列老师位置”的描述，匹配对应选项。
2. 第2题：需查找原文中浮力与重力关系的语句，筛选正确选项。
3. 第3题：结合原文太空浮力的说明，判断插图中乒乓球的正确位置。
4. 第4题：梳理信件全文内容，确定核心主题，匹配主旨类选项。
【解析】
1. 第1题：原文明确提到“The teachers were taikonauts working in China’s space station Tiangong.”，可知老师在空间站，对应选项C。
2. 第2题：原文直接说明“Buoyancy arises due to gravity.”，即浮力由重力产生，对应选项B。
3. 第3题：原文指出太空几乎无重力，几乎无浮力，乒乓球无法上浮；观察插图：A图乒乓球在水中，B图浮在水面，C图在杯外，符合要求的是A。
4. 第4题：信件围绕“天宫课堂系列”展开，介绍相关情况，核心主题对应选项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】
本题为英语阅读选择题，考查学生定位原文关键信息、理解细节及把握主旨的能力，需结合原文逐一分析选项，难度适中。
【难度系数】
0.7
