答案及解析：[单选题]Williams thinks the animal’s heart is getting two conflicting signals at once: the usual “slow down - 语言文学类题库- 答案窝(daanwo.com)-大学生作业答案及考资分享平台

问题：

[单选题]Williams thinks the animal’s heart is getting two conflicting signals at once: the usual “slow down for diving” one and one that says, “Speed up, I need oxygen,” from the muscles. The former seems to win out, putting the narwhal at risk. In lab rats, a low heart rate and a sudden fright and flight reaction can lead to cardiac arrest. And some researchers think an inappropriate drop in heart rate may explain why the heart stops in some people when they are frightened, sometimes killing them. (Para. 6) What can be inferred from this paragraph?
AThe narwhal is at risk because its heart can’t slow down for diving.
BLacking oxygen in muscles is more risky for the narwhal.
CThe conflicting signals to the narwhal’s heart could result in cardiac arrest.
DThe narwhal has a very fragile heart.

Tags：学堂在线华南理工大学学术英语(2021春)课后作业题答案

答案解析：

╋纠错

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