- Junior high school days will be over _______ a week. How are you feeling?
- I'm trying to keep my cool because we've been together ________ three years.
A:in; in
B:for; in
C:in; for
D:for; for
有200粒种子,适宜条件下98粒萌发了,发芽率是____ .
下列实验现象叙述正确的是( )