若关于x的方程2k﹣3x=4与$\frac{1}{2}$x﹣3=0的解相同，则k的值为（　　）

漫画《拆》告诫我们（    ）

阅读短文，然后从方框中选出可以填入文中空白处的单词

    suddenly  onto  something  pushed   back  swam  friendly  towards  follow  huge

    Last month, I went to swim in the sea. I____ really far, past the rocks and out to sea.    Then I saw  ____ moving towards me. It was ____ and grey, with a large fin. It was a shark! I began to swim  ____, but he beach was too far away. The shark started to swim around me.

    I was really scared, ____ another creature appeared next to me in the water. It was a dolphin! It ____ me away from the shark. I sat on its back as it swam  ____ the beach.

Soon we were near the beach. The shark did not  ____ us. As soon as I stepped ____ the beach, the dolphin swam away. I will always remember how this ____ animal saved my life.

如图表示血液、血浆、血细胞三个概念之间的关系，正确的是（　　）

下列对于逆反心理和逆反行为的认识正确的是（     ）