GRE阅读练习每日一篇(五十)_GRE阅读

GRE阅读练习每日一篇(五十)

　　LDL s are secreted from the liver in the form of precursors called VLDL s

　　VLDL remnant particles contain small amounts of cholesterol

　　triglycerides are removed from VLDL s by fatty tissues

　　LDL receptors remove LDL s from the blood

　　21. The development of drug treatments for some forms of familial hypercholesterolemia is regarded by the author as

　　possible, but not very important

　　interesting, but too costly to be practical

　　promising, but many years off

　　extremely unlikely

　　highly probable

　　22. The passage implies that if the Watanabe rabbits had had as many LDL receptors on their livers as do normal rabbits, the Watanabe rabbits would have been

　　less likely than normal rabbits to develop heart disease

　　less likely than normal rabbits to develop high concentrations of cholesterol in their blood

　　less useful than they actually were to scientists in the study of familial hypercholesterolemia in humans

　　unable to secrete VLDL s from their livers

　　immune to drugs that lower cholesterol levels in people with certain forms of familial hypercholesterolemia

　　23. The passage implies that Watanabe rabbits differ from normal rabbits in which of the following ways?

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