请教几道语法题

gamawangjiu

希望大家能指点一下

1，The spice cinnamon and the drugs cascara and quinine(all come)from bark,the protective(out) layer of (stems and roots)of woody (plants)

答案选B为什么

2，Astronauts receive (extensive) training ot prepare (themselves）（both)physically and psychologically (for complexity) and rigor of a space mission.

答案选D为什么

一个人的圣经

out---->outter

for complexity----->for the complexity