恒牙骨化开始的年龄是
A.新生儿
B.1岁
C.2岁
D.3岁
E.4岁
参考答案:A
You have the ______ of working hard and being successful or not working hard and being unsuccessful.
A.selection
B.choice
C.alternative
D.option
在高速公路行车时,应在右侧的路肩上行驶。