母乳喂养可以避孕吗？
参考答案：
不能用母乳喂养当做避孕措施，但母乳喂养可以帮助母亲减少受孕概率。母乳喂养期间应使用避孕套避孕。
表示我国地势第二和第三级阶梯分界的是（ ）
A．甲
B．乙
C．丙
D．丁
Cheer up, Maria! You can also enjoy _____ you have been dreaming of, if you don't lose heart.[ ]
A. as a convenient life as
B. as convenient a life as
C. as a life convenient as
D. convenient as a life as
