下列关于基因的描述，正确的是（　　）

根据短文理解选择答案。

    In many English homes people eat four meals a day. They have breakfast at any time from seven to nine in the morning. They eat porridge(粥), eggs or bread and drink tea or coffee for breakfast. Lunch comes at one o’clock. Afternoon tea is from four to five and dinner is about half past seven. First they have soup, and then they have meat or fish with vegetables. After that they eat some other things, like bananas, apples or oranges. But not all English people eat like that. That is to say, most Englishmen have breakfast, lunch, afternoon tea and dinner in a day.

在下列转化关系中，各物质均是初中化学常见物质，其中甲、乙、丙属于单质，A为黑色固体，C属于盐．①甲+乙 B ②甲+丙 A

③A+D→C+B ④C+E→Cu（OH）₂↓+NaCl

回答下列问题：

小明沿水平方向用力推地面上的桌子,但没有推动.下列说法中正确的是     （    ）