A:8a
B:4a
C:2a
D:a
关于各元素相对含量说法正确的是( )
下列有关菌落的叙述中,不正确的是( )
Today is my birthday. I am a girl. My name is Han Mei. I'm nine years old. I have a birthday party. I have a birthday cake and many gifts. My father and my mother say“Happy birthday!”to me. I'm very happy.