心理学家发现，大多数人都有心理上的“异性效应”，青少年尤甚。这启示我们（    ）

不等式组$\left\{\begin{array}{c}x\le 1\\ \frac{x-1}{2}<x+1\end{array}\right.$的解集在数轴上表示为（　　）

下列实验正确的是（　　）

根据短文选择答案。

Sam lives in New York City. His father has a shop there, and his mother is a teacher. He is seven years old now and begins to go to school this autumn. The school is a little far from their shop, so his father drives him to school every day. He is never late for school and his teachers like him. It's Monday today. Miss Hunt is teaching the students to count(数数) from one to ten. Sam studies hard. Soon he can count them. Miss Hunt is happy and asks, “How many people are there in your family, Sam?” Sam stands up and begins to count with his fingers. Then he says, “Two, Miss Hunt.”“Who are they?”“My father and mother.” “Oh,”Miss Hunt is surprised and says, “There are three people in your family!”“But now I’m not at home. I'm at school, you know!”

①小玲家6月份生活费总支出是1600元．其中支出最多的一项是____，文化教育费支出了____元．

②如果小玲家每个月生活费都是1600元，请你对她家7月份（暑期）的生活费用提出调整建议．____