①这里的天空____的，表面却洒满____的阳光。月球上满是____、岩石和____，没有____，没有任何____。月球是一片____。

②把玉米种在月球的____里，和在地球____里生长没有明显____。可是，____一旦放进月球尘土，水藻就长得特别____。

如图所示漫画《缺少》启示我们（    ）

①留守儿童已成为社会问题，需要给予特殊的关注

②父母应尽到家庭保护责任，让留守儿童感到亲情的温暖

③应调动社会各方面的力量，为留守儿童的健康成长营造良好的社会环境

④为了保护留守儿童的合法权益，必须禁止父母外出务工

将浸泡后的玉米种子从中央纵向刨开，并在剖面上滴一滴碘液，被染成蓝色的部位是（　　）

阅读下面短文, 根据短文内容, 从短文后各题所给的A、B、C、D四个选项中, 选择最佳选项。

    When an ice cream sundae(圣代冰淇淋) cost much less, a boy entered a coffee shop and sat at a table. A waitress put a glass of water in front of him.

    "How much is an ice cream sundae?"

    "Fifty cents," said the waitress.

    The little boy pulled his hand out of his pocket and studied a number of coins in it. "How much is a dish of plain ice cream?" he asked.

    Some people were waiting for a table, and the waitress was not patient. "Thirty-five cents," she said angrily.

    The little boy again counted the coins. "I will have the plain ice cream," he said. The waitress brought the ice cream and walked away. The boy finished, paid the money, and left.

    When the waitress came back, she was surprised at what she saw. There were fifteen cents placed beside the empty dish. That was her tip.