40.How could the writer lower his blood cholesterol level
A.By eating less .
B.By realizing the risk of heart disease.
C.By putting a tube through a leg artery up to the heart.
D.By changing diet.
正确答案:D
解析:问题问的是:作者怎样降低血液中的胆固醇含量?文章的最后一句已经提到可以通过改变饮食结构来解决这个问题,所以答案是D.
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