生物都是由细胞构成的，细胞是构成生物体的基本单位．（判断对错）

Li Ming is staying with the Wang's family for the weekend.
Today it is warm and fine. The family are having dinner in the garden. They often have dinner in the garden on a warm and fine spring day. Now Mr. and Mrs. Wang are sitting at the table with Li Ming under a tree.
"It's great to have dinner out here on such a lovely day," Mrs. Wang says. "What's the weather like in your hometown, Li Ming?"Mr. Wang asks. "It's not very warm in spring. But I like the spring there best." "Help yourself to some cakes, Li Ming," Mrs. Wang says. "Thanks," says Li Ming. "The cakes are very nice. I enjoy the dinner very much."

①实践推动人们进行新的探索和研究

②实践是认识产生的唯一途径

③认识只有服务于实践才彰显其意义

④认识有多深刻决定了实践能走多远