根据短文理解, 从A、B、C、D四个选项中选择最佳答案填空。

    Lucy and Lily 1 twins. They are twelve. They 2 a big and nice bedroom. There 3 two beds and two desks in the room. Lucy and Lily like milk and bread, but they 4 tea or meat. You can see some bottles of milk and some bread on 5 desks. But you can't see 6 tea or meat in the room. Lucy and Lily can play 7 football and fly kites. But they can't mend a bike 8 a radio. They are good 9. They 10 very much.

一个实心铅球的质量是4kg，经测量它的体积是0.57×10^-3m³，这个铅球是用纯铅制成的吗？（已知ρ_铅=11.3×10³kg/m³）

图中半扁圆形结构代表水滴，箭头代表盖盖玻片的方向．下列四种盖盖玻片的方法中，最不容易出现气泡的是（　　）