题干
读问句，选择对应的答句。
____①What's the weather like today? A. No, you can't.
____②Where are my books? B. Yes, it is.
____③What time is it? C. It's rainy.
____④Can I wear my new skirt? D. It's twelve o'clock.
____⑤Is it cool? E. They're on the bed.
答案(点此获取答案解析）
C,E,D,A,B
的前
项和为
，若
，且
、
、
三点共线（该直线不过原点
），则
（ ）