—Is Ann your sister?
—__________. She is my friend.
A:Yes, it is
B:Yes, she is
C:No, it isn't
D:No, she isn't
The World Health Organization has given some advice on how to protect us from infected(感染) with H7N9.
北京时间2005年1月18日3时16分,中国南极科考队到达了海拔4093米的南极冰盖的最高点(80°22′0″S、77°21′11″E),回答下题.