The bones, tendons and cartilages require a small amount of blood, ______ such o

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问题 The bones, tendons and cartilages require a small amount of blood, ______ such organs as the kidneys and brain need large amounts of blood.

选项 A、as
B、while
C、because
D、so that

答案 B

解析 while表轻微转折，“而，然而”的意思。句意：骨头、腱、软骨只需要少量的血液，然而像肾脏、大脑这样的器官则需要大量的供血。句子前半句和后半句为轻微的转折关系。

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