The scientist contested the assumption of previous scientists that the fate of human beings could not be predicated.

A．respected

B．supposed

C．suspected

D．assumed

对支气管描述错误的是（）

A．气管在胸骨角平面分为左、右支气管

B．右支气管短、粗、直

C．右支气管细、长、斜

D．左支气管细、长、斜

E．异物易落入右支气管