66. chemical化学的 化学制品

　　Low-till farming increases harvests and reduces water use, and this method reduced the need for chemical products. because they are few unwanted plants.

　　67. chief主要的 首要的 首领 长官

　　Once more than fifty hundred pairs of bald eagles nested across the country, but by 1960, that number had fallen below four hundred. the chief killer was the wildly used DDT.

　　68. choice选择 选择权

　　There was no real significance in the choice of lucky number.

　　69. choke窒息 呛

　　Enviromental scientist praises the teenages for removing garbage that can harm wildlife, waterbirds, for example, can choke on plastic bottle rings, and get cut by scrap metal.

　　70. choose选择 决定

　　Im looking for a department with a monthly rent to around 200 dollars in his neighborhood, can you give me some advice on that?

　　It is rather hard to find anything for less than 300 dollars around here. Rents are often lower in the suburbs. But you will need transportation if you choose live here.

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