More than seventy percent of the water on the earth is sea water.
举一反三
- Under the same conditions, fresh water evaporates faster than sea water.
- 2.______ of the earth surface is covered by water. A: thirty percent B: forty percent C: fifty percent D: seventy percent
- 32.Less than _______of water on earth is fresh water. A: 3% B: 4% C: 5% D: 6%
- In many places, tap wateris both clean and ____1__. In fact, there are more unhealthy chemicals in bottled water. These ____2__ come from the plastic. Here’s another fact: Most bottled water is the same as tap water. Both tap and ____3__ water come from rivers and lakes. But bottled water is more expensive. It costs almost a ____4__ times more than tap water. Putting water in bottles also wastes water. Water is used to clean bottles first, and this is ___5____. Of course, in some places, people need to drink bottled water. The tap water isn’t clean in those places. But this must ____6__. Eighty percent of plastic bottles go in the trash. And this is very bad for our ___7____.
- _______ from space, the earth, with water _______seventy percent of its surface, looks like a blue ball. A: Seen, covering B: Seeing, covering C: Seeing, covered