下列不属于环境影响生物的是（   ）

若$\overrightarrow{a}$=(3,-1)，$\overrightarrow{b}$=(-3,2)，则$\overrightarrow{a}$$·$$\overrightarrow{b}$=____ 

将下列语句依次填入文段的空缺处，正确的选项是（     ）

    你的话语应该是一缕包含早春气息的柔风，         ；你的表白应该是田野爆裂的豆荚，          ；你的辩答应该是凭借原则的盾牌，        ；你的呐喊应该是仰仗正义的力量，         。

①迎承谈判桌上的唇枪舌剑       ②构思并阐述金色的成熟         ③弥合朋友之间人为的小隙       ④澎湃青春的热忱和血液

如图所示，质量相等的A、B两物块置于绕竖直轴匀速转动的水平圆盘上，且始终相对于圆盘静止，两物块到竖直轴的距离r_A＞r_B．则两物块（　　）

    A woman was lucky. One day, she had a chance to visit 1 the hell(地狱) and the heaven(天堂).

    An angel(天使) took her to the hell first. The woman 2 a table in the hell. There was lots of food on the table. Many people sat around the table, but they felt 3^. They were hungry." Why are they still hungry with so much food here?" she asked the angel.

    "Look at their 4," the angel said. The people held 5 chopsticks(筷子) in their hands. They used the chopsticks to 6 the food. But the chopsticks were so long that they couldn't 7 the food to their mouths.

    Then the angel took her to the heaven. There was a table and there was food on it, too. They 8 used long chopsticks. People there felt happy. They weren't hungry 9 they learned to feed each other.

    That's the 10 between the hell and the heaven. Can you understand it?