若子程序内无M99，则执行子程序结束时，可能会报警或出错。
A. 对
B. 错
The edible mushroom ____ a cushion-like, moist cap that is light brown or darkish red.
A. which has
B. to have
C. having
D. has
_____ full preparations, we decided to put off the meeting till next week.
A. We had not made
B. Having not made
C. Not made
D. Not having made
The meaning of a word can sometimes be guessed from its ____.
A. contest
B. context
C. content
D. contact
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