A：
B：
C：
D：
A：Hi, Li Ming.
B：Hi, Mrs Li.
A：What are you doing?
B：I'm reading a story book. What are you doing?
A：I'm writing a letter. May I look at your story book?
B：Certainly. Here you are.
A：Thank you.
仿照例子写句子。
例: I did not play (not play) football this morning.
所有昆虫的幼虫都要经过五次蜕皮．（判断对错）
是第二象限角，且sin(
)= 
则tan2
﹥0成立的最大自然数n的值为．
