题干
—Can I have ______ water, Mum? I'm so thirsty.
—Sorry, there isn't ______, but we still have some green tea.
—Sorry, there isn't ______, but we still have some green tea.
A：any; any
B：any; some
C：some; any
D：some; some
答案(点此获取答案解析）
C
的离心率为
，则它的长半轴长为（ ）
