Warmblooded animals live an active life
题型:选择题
问题:
Warmblooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
A.keep up
B.build up
C.bring up
D.pick up
Warmblooded animals live an active life even in freezing winter,which helps them to ________ their normal body temperature.
A.keep up
B.build up
C.bring up
D.pick up