—I feel terrible. I didn't do well in the math test.
—________. You're already making progress and will surely learn it well.
A：Don't be silly
B：Don't take things for granted
C：Don't put the cart before the horse
D：Don't take it too hard
如果苯丙酮尿病（智力障碍）的孩子的父母都正常，那么，这对夫妇再生一个正常孩子的机会是（）
