①求甲容器中距底部0.1米处水的压强；

②若乙的体积为1×10^﹣3米³，求乙的密度；

③现有物体A、B、C（其密度、体积的关系如下表所示），请只选择其中的一个物体，把物体放入甲容器中（水不溢出）和放置在柱体乙上面，使甲容器底部受到水的压强变化量与柱体乙对地面压强变化量的比值最大，求这个最大比值．

    There is a little boy named Mark. He hopes he could fly like a bird. His parents tell him, “Dear, you can't fly.” “Why can't I? Some birds in the zoo are very big, but they can fly.” The boy can't understand.

    There is another little boy named Barry. He is crippled(跛脚的). He wishes he could walk and run like other children.

    “Why can't I walk or run like other children?” Barry asks his father. His father doesn't know what to say.

    One day, the two boys meet in a park.

    “Do you want to fly like a bird?” Mark asks Barry.

    “No,” Barry says. “ I just wish I could walk and run like you.”

    Mark thinks for a minute, walks to Barry's father and says something into his ear.

    “That's OK,” says the father.

    Mark goes to Barry and says, “Get onto my back. Let's run together.” Then Mark carries Barry and begins to run. He runs faster and faster. He runs across the park with Barry on his back. The crippled boy flaps(拍打) his arms up and down in the wind. He shouts at the top of his voice, “We're flying, Mark! We're flying!”

回答下面5个问题, 每题答案不超过7个词。

新学期开始，在分配一些劳动任务时，老师常让女生擦桌椅、打扫教室卫生，而让男生搬桌椅、搬运新书。老师之所以这样分配是因为（    ）

若x,y满足约束条件$\begin{array}{c}\left\{\begin{array}{c}y\le x\\ x+y\le 1\\ y\ge -1\end{array}\right.\end{array}$，则目标函数z=2x+y的最大值是 （ ）

    Little Duck and Little Rabbit also have a wind-bell. The ____of the wind-bell is like music. It's beautiful. Little Pig ____to hear the sound of the wind, too. Little Pig wants to make a ____wind-bell. The wind is blowing ____. But it's too ____. Little Pig doesn't like it.