The way that a pump works is used to ________ how the heart send
The way that a pump works is used to ________ how the heart sends blood around the body.
A、estimate
B、survey
C、claim
D、illustrate
【正确答案】:D
【题目解析】:illustrate阐明,举例说明;图解。句意:泵的工作原理用来说明心脏是如何把血液输送到全身各处的。