细胞生长到一定程度后，就不会再长大了．（判断对错）

据统计，近几年全世界森林面积以每年约1700万公顷的速度消失，为了预测未来20年世界森林面积的变化趋势，可选用____统计图表示收集到的数据．

阅读短文，判断正误。用“正确”或“错误”表示。

Penguins are good swimmers, and they are very good at swimming in the sea. They can dive much deeper than people. Some people can dive about 180 metres, but most people can only dive about 30 metres. Penguins can dive 500 metres. That is a long way down! Do you know the TV Tower in Shanghai? That is 468 metres high.

 Penguins can hold their breath much longer than people.Some people can hold their breath for about five minutes, but most people can only hold their breath for one or two minutes. Penguins can hold their breath for 20 minutes.

Many whales can hold their breath longer than penguins. Some whales can hold their breath for about two hours!