完形填空

    Mr. Wu is having a class in Class Five．He is asking students to think about(思考)  1  future 1ife．Here are some students' opinions(观点)．  

    Zhang Wei thinks people will live in the2like fish．because in the future people will 3organic silicon(有机硅)to breathe(呼吸)in the sea．And people will build 4and schools in the sea．Then they can see doctors and go to school．He

thinks life in the sea will be very 5  and comfortable．

    Luo Li thinks  6 in the future will be great．Every family will have a car．And these cars will 7  in the sky．People will drive cars to their offices．

  Wang Kai thinks machines like robots will do work for people,   8  people will have more 9  time to enjoy life．He thinks people will have short winter holidays but long  10holidays because the summer will be very long．

读课文填空。

威尼斯小艇在构造上有与众不同的特点：

①长度为____，有点像____。

②制作比较讲究，船头和船艄____，像____。

③行驶起来____，仿佛____。

④船舱里有____。

如图所示，甲、乙两个实心均匀长方体物块放置在水平地面上。现沿水平方向切去部分甲和乙后，甲、乙对地面的压强分别为p_甲、p_乙。则下列做法中，符合实际的是（  ）

如图所示，竖直平面内有坐标系xoy，在第二象限有平行于坐标平面的匀强电场E₁（未画出），第一象限有与x轴夹角θ=53⁰的虚线0P，虚线OP与x轴组成的空间内有水平朝左的匀强电场E₂，有一个质量为m=2kg，带电量为+1C的带电粒子，以竖直向上的初速度v₀=10m/s从第二象限的A点出发，并以v=5m/s的初速度垂直于虚线经过虚线上的P点，并最终刚好从P点正下方以速度 $\sqrt{185}$  m/s穿过x轴．（g=10m/s²）