题目

口算。60+9= 15-8= 12+6= 73-3=96-90=30+4= 12-9= 20+8=70+5= 16-8= 15+4= 48-40=17-9= 50+9=67-7= 10+8=12+6= 34-4= 20+5= 18-6= 答案：60+9=69；15-8=7；12+6=18； 73-3=70；96-90=6；30+4=34；12-9=3；20+8=28；70+5=75；16-8=8；15+4= 19； 48-40=8；17-9=8；50+9=59；67-7=60；10+8=18；12+6=18；34-4=30； 20+5=25；18-6=12。My watch ______ 2 minutes. Would you be so kind as to set it backwards?A．gainsB．getsC．winsD．loses