34×13=14(千米),
14+13=712(千米),
答:两周一共挖了712千米.
_______ the teachers in the school is one hundred, and ________ of them are women teachers.
A.A number of; four-fifth
B.The number of; four-fifth
C.A number of; four-fifths
D.The number of; four-fifths
人体具有最多的线条是( )
A.直线
B.曲线
C.蛇形线
D.折线