题目

在下图中，能表示人的受精卵在分裂过程中DNA含量变化以及精细胞在形成过程中染色体数目变化的曲线图分别是（     ）                                         A．①和②           B．①和③         C．②和③                D．④和③ 答案：B搭配。1. If an insect bites you,2. If oil bures you,3. If your foot is hurt badly,4. If you cut your fingers,5. If your stomach hurts,A. You should not eat anything and go to the hospital.B. you should cool the area with clean water.C. you should wash the area with cold water.D. you should put paper around the cut.E. you should don’t walk.