She was so amused with the magician’s tricks that she ________ a smile.

A．burst out

B．burst into

C．burst forth

D．burst in

腰椎间盘突出症的最好发节段是

A．胸₁₂腰₁

B．腰_3、4

C．腰₅骶₁

D．腰_2、3

E．腰_4、5