问题
不定项选择
二氧化碳对长波辐射有强烈的吸收作用，行星表面发出的长波辐射到大气以后被二氧化碳截获，最后使大气升温，大气中的二氧化碳像暖房的玻璃一样，只准太阳的辐射射进来，却不让室内的长波热辐射出去，大气中的二氧化碳的这种效应叫温室效应，这是目前科学界对地球气候变暖进行分析的一种观点，根据这种观点，以下说法正确的是[ ]
A．在地球形成的早期，火山活动频繁，排出大量的二氧化碳，当时地球的气温很高
B．经过漫长的年代，地壳的岩石和气体二氧化碳发生化学反应，导致二氧化碳减少，地球上出现了生命
C．由于工业的发展和人类的活动，导致二氧化碳在空气中的含量增大，地球上的气温正在升高
D．现在地球正在变暖的原因是工业用电和生活用电的急剧增加，使电能和其他形式的能转化为内能
答案
ABC
Remind children that bad things don’t last. It may sound simple, but the message is extremely important. “Children often don’t have the experience to know that when something bad happens—they lose an important game or their best friends lets them down—it’s not the end of the world,” explains Nancy Leffert, a senior research scientist with the Research Institute, an American adolescents’(青少年) and children’s research group. “They think their bad feelings will last for ever， or that one failure will ruin everything.”
Unfortunately, that kind of thinking discourages motivation(动机).“If a child believes that the cause of her upset is lasting, or that nothing she does will make a difference, it decreases her ability to keep on trying,” says Dorothy Rich, president of the Mega Skills Education Center of the Home and School Institute, based in Washington. Any time you can help your child see that a situation is not lasting, that a result can be changed, or that one opinion does not reflect reality, you give her reason to hope.