A:休渔期间继续捕捞
B:加强海洋执法力度
C:防止海洋污染
D:对海洋资源进行合理开发
“三角” 表示3abc,“方框” 表示﹣4xywz,则 =____ .
“One tree can't make a forest” tells us no one would be heroes ____ (with) his friends.
蝗虫的体表有外骨骼,外骨骼的作用是____和____内部柔软器官,为防止体内____蒸发,更好地适应____生活.