在显示手信号时，凡昼间持有手信号旗的人员，应将信号旗拢起，左手持处防护。红旗，右手持（）。
参考答案：绿旗
在下面的自我介绍中，填入合适的词。
Hello. My name is Jim. I'm from England. My favourite subject (学科) is 1______. My favourite sport is
2______, and I often play football with my friends. My favourite colour is 3______. I have a 4______ family.
They are: my father, my mother and I. My parents 5______ me.
小东身高1.6m，站在操场上他的影长2.4m，这时测得旗杆的影长是18m，旗杆有多高？
