— Can you tell me why you learn English so well?
— It's easy. ______ you work, ______ grades you can get.
A：The more careful; the better
B：The more carefully; the best
C：The more carefully; the better
—I'll go to Beijing.
砖与陶瓷在水中的沉浮情况（ ）
已知一次函数y=2x+2与x轴y轴分别交于A、B两点，另一直线y=kx+3交x轴正半轴于E、交y轴于F点，如△AOB与E、F、O三点组成的三角形相似，那么k值为（ ）
