人体内动脉血变为静脉血，是血液经下列哪一途径实现的  (    )

看图读一读，判断句子正误。

Ann: Look at the animals. I like pandas. They're fat. They're cute. They're black and white. They like bamboos(竹子). What do you like, Ben?

Ben: I like elephants. They're grey. They're big and strong. They like grass.

Ann: Do you like lions, Ben?

Ben: N0. I don't. They're fierce(凶猛的). They're brown. They like meat. They eat small animals.

“五一”小长假，中央电视台千岛湖水下古城探秘大型直播把很多人吸引在电视机前．某科学兴趣小组通过查询资料进一步了解有关该事件的信息，这次探秘的主要任务是由机器人下水完成，该机器人的有关数据：体积为0.2立方米；工作水深300米；水下最高速度3节（1节=1.852km/h）．（g=10牛/千克）

—How many crayons do you see?—I see ____（fourteen / forteen）.（14）

有“地球之肺”之称的是（　　）