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? ② The poor children (依靠) those rich people’s support. ? 6. The air in the atmosphere is made up of dust and gases. ? be made up of 由 …… 構成,由 …… 組成 ? 例如: ? The class is made up of 20 boys and 19 girls. ? The teacher team is made up of 126 teachers. ? 7. More than three—fourths of the gas is nitrogen. ? three—fourths 四分之三 ? 分數(shù)的概念: ? 分數(shù)由基數(shù)詞作分子,序數(shù)詞作分母構成,分母序數(shù)詞都用復數(shù)。 ? 11) Something should be done about the use of cars in order to have cleaner air. ? 為了得到更清潔的空氣,應該就汽車的使用問題采取措施。 ? 9) Big cities are full of cars. 大城市里都是汽車。 ? 7) More than threefourths of the gas is nitrogen. ? 氣體中四分之三的氣體都是氮氣。 ? 5) More than threefourths of gas is nitrogen. ? 多于四分之三的氣體是氮氣。 ? 3) The atmosphere protects the earth from the sun’s heat. ? 大氣層保護地球免遭太陽的炙烤。? 本單元的重點知識: ? 1. 單詞:熟練掌握本單元后單詞的音、形、意 ? 2. 詞組: ? 1) be made from 由 …… 制造 ? 2) be made of 由 …… 制