It carries white blood cells and disease-fighting chemicals called antibodies to places where foreign invaders such as bacteria

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问题 It carries white blood cells and disease-fighting chemicals called antibodies to places where foreign invaders such as bacteria and viruses are causing infections this statement______.
In this article the author states that blood test has______.

选项 A、only one function
B、two functions
C、three functions
D、four functions

答案C

解析 细节题。作者在第十段第二句提到血检可以用来检测感染的征兆,以及第十二段首句中提到血检可以测出血液里各种化学成分的浓度和血液中循环的血液细胞的变化及类型。可见血检有三个功能。
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