题目

如图在边长为1的小正方形网格中，A、B、P、Q四点均在正方形网格的格点上，线段AB、PQ相交于点M，则线段AM的长为_______ ______. 答案：After two hours ,they were tired _____picking cotton  and had a ______. of ;stop  B.with ;break  C.for ;rest  D at; pause