New Words：

hill [hɪl] 山丘;小山
mountain [ˈmaʊntn] 高山;山岳
gas [ɡæs] 煤气;天然气

Can you find Black Hill on the map?
We climbed to the top of the hill.

What's the highest mountain in the US?
Snow was falling on the mountain tops.

The price of gas rose.
Gas rose in price.
Gas is coming down in price.
Gas is cheaper than coal.

标签: none