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billion n. 十亿；千兆
total n. 总计；总数
adj. 总的；总计的
increase v. 增加；增大
indian adj. 印度的 n.印度人
Atiantic n.&adj 大西洋（的）
Arctic adj. 北极的
Listen the lesson and match each paragraph with its main idea.
Let's Do It !
Paragraph 1 a.Six of the seven continents are good for people to live on.
Paragraph 2 b.We should treat the earth well.
Paragraph 3 c.An increasing population is a big problem for the earth.
Paragraph 4 d.Two thirds of the earth is covered with oceans.
Paragraph 5 e.People cannot live everywhere on the earth.
Language points:
1.in total总计，总共.相当于in all.
e.g. I have 9 subjects in total/all.
2.分数的表达法：
1）母序子基，分子大于1，分母加s.
1/5
2/3
2)特殊表达法：
1/2 a half
1/4 a quarter
3/4 three quarters
3)当分数加of做主语时，谓语动词的单复数与其所修饰的名词的单复数保持一致。
e.g. Two thirds of the students ____(be) boys.
Three fourths of the water ____(be) polluted(污染).
3. be covered with 被…覆盖
e.g. The ground is covered with soil.