给划线字选择正确的解释

劲：A.趣味；B.力气；C精神；D.神情、态度。

①他的手劲儿真大。                                ____

②下棋没劲，不如打电脑。                            ____

③瞧他那股骄傲劲儿。                              ____

缠：A缠绕；  B纠缠；  C应付。

④这人真难缠，跟他说了半天，他就是不走。            ____

⑤这个箩筐缠了几根铁线后，很牢固。                ____

⑥半天了，他还缠着我不放，我只好给他钱，打发他去买火柴。____

阅读短文，选择正确的答案。
    A little mouse thought he was the tallest and strongest animal in the world. His mother said to him, "Don't say that in front of an elephant. He doesn't like that." The little mouse didn't listen to his mother. He went out to look for the elephant, but he didn't know who the elephant was. He asked an ant(蚂蚁) first, "Are you an elephant?" "No, I'm not," said the ant. "An elephant is much bigger than I am." Suddenly(突然), he saw four big trees. "Let me climb up(爬上) a tree. Then I can see where the elephant is," said the little mouse. "Get down! Get down!" someone shouted(喊) to him. "I'm the elephant. Go and climb that tall tree nearby. Then you can see me." "Now, I see. The elephant is the tallest and strongest animal in the world," said the little mouse.

在平行四边形 $ABCD$ 中， $AC=8$ ， $BD=6$ ，则 $AD$ 的取值范围是____．

下列选项中，不属于生命现象的是（   ）

一质点做匀加速直线运动，经过A点时的速度是4m/s，经过B点时的速度是8m/s，则质点从A到B的平均速度为____m/s．质点从A到B中间时刻的速度为____m/s．