玉米果穗上常出现缺粒，造成这种现象最有可能的原因是（ ）
A：水分不足
B：光照不足
C：传粉不足
D：营养不足
袋装肉肠适宜采用下列方法中的( )保存
A. It's a cake.
B. Hello, Li Hong.
C. Thank you.
Li Hong: Hello, Gao Ling.
Gao Ling: ____
Li Hong: What's this?
Gao Ling: ____ Happy birthday to you.
Li Hong: ____
Gao Ling: You're welcome（不用客气）.
