在绕地球做匀速圆周运动的“天宮“二号太空舱内，下列哪个实验可以正常进行进行（   ）

阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中选出最佳答案。

    One day, a little schoolboy went home with a pain in his stomach.

    "Well, sit down and 1 a cake," said his mother."Your stomach 2hurting because it's empty.It'll be all right when you've got something in it."

    Five minutes later, Dad came home 3 the office.And he said he had a headache.

    "That's because your head is 4," said his clever son."You'll be all right if you have got 5 in it." His dad and mum laughed.

2013年2月，中国海监在钓鱼岛海域放置浮标以监测我国领海的水文变化，监测发现，从春季至夏季，海水温度上升，体积膨胀导致密度下降．此过程中，若浮标体积保持不变，则（   ）

中央电视台体育频道“康龙武林大会”栏目，以其强大的媒体优势，通过创新节目的内容与形式将中华传统武术的精髓淋漓尽致地展现给了世界亿万观众，赢得了广大观众的喜爱，它的收视率是NBA常规比赛的3倍以上，并且韩国、欧洲很多电视台都纷纷与中央电视台洽谈购买播出版权事宜。这说明（  ）
①大众传媒在文化传播中发挥着重要作用   ②文化与经济相互交融　　
③文化创新能够促进民族文化的发展  ④中华传统武术是民族精神的火炬　

画一条4厘米5毫米的线段