根据短文理解，回答下列问题。

      A mother planted many kinds of vegetables in her garden. One morning she said to her daughter. “Betty, come here. Look at all these little yellow marks on the leaves of the cabbages. They are eggs of a kind of insects. They are very beautiful but very bad for cabbages. This afternoon you must find all the eggs on the leaves and kill them. In this way, you will help us have better greener and bigger cabbages.”

      Betty didn't think she should do it at once and in the end she forgot all about it. Her mother was ill for a few days and couldn't work in her garden. When she was well, she took Betty to the garden to see the cabbages. To their surprise, the insects had eaten up every leaf. When Betty saw this, she was upset and began to cry. Then her mother said to her, “We should never put off what we have to do today till tomorrow. And you must learn to deal with the things while they are small. or it will turn into a big problem.”

名著导读

【甲】

【乙】人最宝贵的东西是生命，生命属于人只有一次，人的一生应当这样度过：当他回首往事的时候，他不因虚度年华而悔恨，也不因碌碌无为而羞愧。在他临死的时候，他能够这样说：我的整个生命和全部精力，都献给了世界上最壮丽的事业——为人类的解放而斗争。

如图甲所示，验电器A带负电，B不带电．用带有绝缘手柄的金属棒把验电器A、B两金属球连接起来的瞬间（如图乙所示），金属棒中（   ）

PM2.5是指大气中直径小于或等于2.5微米的颗粒物，也叫可入肺颗粒物，与肺癌、哮喘等疾病的发生密切相关，是雾霾天气的主要原因，它主要来自石化燃料的燃烧等，下列与PM2.5相关的说法不正确的是（　　）