小明帮父母收获玉米时，发现有些“玉米棒子”上只有很少的几粒玉米．你认为造成这些玉米缺粒最可能的原因是 ( )。
A：水分不足
B：光照不足
C：无机盐不足
D：传粉不足
Talking with others _______ you feel less _______.
________ the job takes a significant amount of time, most students agree that the experience is worth it.
