Passage B

Questions 26 to 30 are based on the passage you have just heard.

A．The lack of air pressure.
B．The extremely hot or cold temperatures.
C．Exposure to radiation.
D．An inadequately ventilated space suit.

A．A lesson requires students’ active involvement.
B．Students usually take an active part in a lecture.
C．More knowledge is covered in a lecture.
D．There is a larger group of people interested in lessons.