图1是我国某省劳动年龄组（男16-59岁，女16-54岁）、低于劳动年龄组、超过劳动年龄组人口占总人口的比重随年份变化的示意图，图中a、b、c表示不同的年龄组。完成下列问题。

若实数a，b满足ab＜0，且a＜b，则函数y=ax+b的图象可能是（　　）

根据对话内容判断下列句子正误。

John：What did you do last Saturday，Mike?

Mike：On Saturday I went to the zoo．

John：Did you go there by yourself?

Mike：No．I went there with my brother．

John：What about Sunday?

Mike：I helped my mum with the housework．

John：Did you wash the clothes?

Mike：Yes．Also l cleaned the window and cooked with my mum．What about your weekend?

John：Nothing special．I just was at home and did my homework on Saturday．and I visited my grandparents on Sunday．

    湖间带为涨潮水位最高时会被淹没，退潮水位最低时会出露的区域。古代澎湖列岛渔民在潮间带创造了众多独特的捕鱼陷阱－－石沪。石沪是用玄武岩石块相互“咬角”固定而垒成，石材间隙处以较小的石块或珊瑚礁填入并敲实，没有任何黏胶、铁链等外来物的牵连固定。石沪核心部分由潮池和沪墙组成，内侧是人工加深的潮池，石沪沪墙“朝内（潮池）一侧陡，向外一侧缓”，石墙上有渔民“种养”的藻类、贝类等黏性大、吸附能力强的生物。左图示意澎湖列岛的位置，右上图为著名的“心形项链”石沪（其开口朝北），右下图示意石沪沪墙剖面。