A：cm2
B：cm3
C：m3
D：dm3
你想说老鼠的尾巴很长，可以说：
—I think it's really necessary. It is reported that the food that Chinese people _____ every year is enough to feed 200 million people for a year.
有关影响旅游安全因素的叙述，正确的是（ ）
