根据材料和图，结合所学知识，回答下列问题。
新疆罗布泊水面再古代曾经超过3000平方千米，100多年前尚存500多平方千米，1972年完全干涸。塔里木河曾经是罗布泊的主要水源。20世纪后半期，塔里木河流域修建水库200多座，耕地面积扩大约1倍。
从方框中选择最佳选项完成对话, 有两项多余。
A. Are you having a party?
B. What is the weather like?
C. Where are you?
D. What do you do?
E. I'm calling to say happy birthday.
F. What are you doing?
G. How about you?
A: Hello, Sam?
B: Maria?Hi! ____
A: I'm in Australia! ____
B: Oh, thanks.
A: So how is it going there?
B: Great! ____
A: Pretty good. ____
B: I'm having a party. My whole family is here.
A: That sounds like fun. ____
B: Terrible. It's cold and raining.
设Sn为等差数列{an}的前n项和，若a5＞0，a1+a10＜0，则当Sn最大时正整数n为（ ）
洋葱是实验室中常用的材料，下列叙述错误的是（ ）
