（）有助于花芽分化及开花良好，花肥。
参考答案：磷（P）
改错，下列各句均有两个错误，请指出并改正。
1. Danny is skateing for wards.
2. There is four season in a year.
3. Sometimes Danny learn to make snow balls.
4. Are winter your favourite seasons?
5. Danny walk to park yesterday.
国际标准化组织ISO所提出的信息系统安全体系结构中定义了（）种安全服务。
A.8
B.7
C.11
D.5
