（1）Swallows fly back to the ____ part of the country in winter every year.(南方)
（2）The space sleeping bag is fixed to the walls to prevent ____ .（飘浮）
（3）I am not sure whether the watches are those ____ .(绅士）
（4）You will get much____ if you give up eating fast food.(苗条)
（5）It is said that this kind of the car is____ designed for her.(特别的)
（6）In winter you’d better keep____  warm enough to stay healthy.(you)
（7）We____  could not believe our ears when we heard the surprising news.(simple)
（8）The water in the river is ____ . You can drink it without cooking.(harm)
（9）Works of MoYan is very popular among Chinese____  .(read)
（10）My daughter hopes to go abroad for ____ (far) study next year.

如图，一固定的竖直汽缸由一大一小两个同轴圆筒组成，两圆筒中各有一个活塞，已知大活塞的质量为m₁=2.50kg，横截面积为s₁=80.0cm²，小活塞的质量为m₂=1.50kg，横截面积为s₂=40.0cm²，两活塞用刚性轻杆连接，间距保持为l=40.0cm，汽缸外大气的压强为p=1.00×10⁵Pa，温度为T=303K，初始时大活塞与大圆筒底部相距 $\frac{l}{2}$ ，两活塞间封闭气体的温度为T₁=495K，现汽缸内气体温度缓慢下降，活塞缓慢下移，忽略两活塞与汽缸壁之间的摩擦，重力加速度大小g取10m/s²，求：

“自尊心是一种美德，是促使一个人不断向上发展的原动力。”意思是： （    ）

如图，圆O的直径CD过弦EF的中点G，∠DCF=20°，则∠EOD等于（   ）