如图，为了让灯泡发光，其中a、b分别为（   ）

“晓驾炭车辗冰辙”中的“辗”有什么表达作用？“宫使驱将惜不得”中的“惜不得”说明了卖炭翁怎样的心理？

东营园博园内，高贵典雅的郁金香竞相开放，红的、黄的、粉白的、紫红的…争奇斗艳，决定郁金香花瓣颜色的遗传物质主要存在于细胞的（　　）

____ , I will assign to you as little homework as I can, but it is a fantasy nowadays.

阅读短文，选择正确的答案。
    A little mouse thought he was the tallest and strongest animal in the world. His mother said to him, "Don't say that in front of an elephant. He doesn't like that." The little mouse didn't listen to his mother. He went out to look for the elephant, but he didn't know who the elephant was. He asked an ant(蚂蚁) first, "Are you an elephant?" "No, I'm not," said the ant. "An elephant is much bigger than I am." Suddenly(突然), he saw four big trees. "Let me climb up(爬上) a tree. Then I can see where the elephant is," said the little mouse. "Get down! Get down!" someone shouted(喊) to him. "I'm the elephant. Go and climb that tall tree nearby. Then you can see me." "Now, I see. The elephant is the tallest and strongest animal in the world," said the little mouse.