防护绿地是指用于维护城市环境、卫生、安全及防灾的绿地。
参考答案：对
Though lacking money and support from his family, he ________ to complete the task by himself,
which brought him confidence and experience. [ ]
A. tried
B. attempted
C. ran
D. managed
根据汉字国标码GB2312—80的规定，总计有各类符号一、二级汉字的个数是______。
A．6763个 B．7445个 C．3008个 D．3755个
