Since entry into high school the students have been ________ staying up late in the evening and getting up early in the morning.

A．admitted to

B．allergic to

C．accustomed to

D．attached to

耐力练习并不能提高柔韧性，相反，耐力练习可能导致肌肉和肌腱的缩短，从而使某些关节的活动范围缩小。