听力原文:W: To operate the machine properly, you must keep the top closed while the machine is spinning. M: I should have read the instructions more carefully. Q: What can we infer from the conversation? (14)
A.
The man made a mistake in operating the machine.
B.
The machine doesn't work properly.
C.
The woman is helping the man repair the machine.
D.
The instructions were not clear enough for the man to read.