old: blueworm和heatworm是 different species of roundworm
分析: heatworm的cilia-a single direction, 介绍keratin
blueworm的cilia是directional, keratin是保护温度
new: heat=blue因为keratin
E-blue的地方温度比较低,heat的地方温度高 'The cilia sensed when the temperature was high enough to allow the production of keratin to slow down' 所以heat那里应该慢
C
A (x理解有问题 A是结果 不是起因)
D
B