Mark Twain _____ along the Mississippi River, which was _____ to his writing.

A．was grown up / benefit

B．brought up / benefit

C．grew up / of beneficial

D．was brought up / beneficial

关于屈反射

A．是多突触反射

B．脊髓离断后减弱

C．后放是它的一个特征

D．Babinski's征属于屈反射