What is the topic of this episode of the podcast “Two-Minute Talk”?
A. Experiences of learning English.
B. Practicing English with foreign friends.
C. The benefits of the “flipped classroom”.
D. Educational differences in China and Mexico.
What do we know about how Rosa studied English in Mexico?
A. The class sizes were smaller.
B. There was less class participation.
C. They used the “flipped classroom” concept.
D. People were more eager to talk to each other.
What does Liu Xiang worry about spending too much time on discussion in class?
A. He is scared of making mistakes.
B. He may not be able to think deeply.
C. Other students may not be well-prepared.
D. Too many students speak at the same time.
干粉灭火系统喷嘴的单孔直径不得小于（ ）mm。
A. 6
B. 10
C. 15
D. 20
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