宽容是中华民族的传统美德，下列与之相印证的是（  ）

①山锐则不高，水狭则不深            ②毋以小嫌疏至亲，毋以新怨忘旧恩 

③以大度兼容，则万物兼济            ④自喜蜗牛舍，兼容燕子巢

如图，竖直平面内有一段圆弧MN，小球从圆心O处水平抛出，若初速度为v_a，将落在圆弧上的a点，若初速度为v_b，将落在圆弧上的b点，已知Oa、Ob与竖直方向的夹角分别为α、β，不计空气阻力，则初速度大小之比为（   ）

判断下列各句是否属于比喻句。

“母亲”这个词简单而又伟大，她包含着希望、爱戴以及人们心灵中所能包容的一切温柔、甜蜜，母亲，她就是生活中的一切……
读下图，回答下列问题

完形填空

    People all over the world eat rice. 1 people in Asia (亚洲), Africa (非洲) and South America 2 it every day of their lives. Some people almost don't eat 3 except rice.

    Rice is a kind of 4. There are more than 7, 000 kinds of rice. Most kinds are water plants. Farmers 5rice in many countries even in the southern part of Russia and in eastern Australia.

    No one really knows where rice 6. Someone in China wrote about it almost 5,000 years ago. Some scientists (科学家) think that rice 7 in West Africa first, but 8 think it 9from India and then was 10to other parts of the world.