附：回归直线的斜率和截距的最小二乘估计公式分别为： $\widehat{b}=\frac{\sum _{i=1}^n\left(t_i-\overline{t}\right)\left(y_i-\overline{y}\right)}{\sum _{i=1}^n{(t_i-\overline{t})}^2}$ ． $\widehat{a}=\overline{y}-\widehat{b}\overline{t}$ ．

参考数据：（﹣3）×（﹣1.4）+（﹣2）×（﹣1）+（﹣1）×（﹣0.7）+1×0.5+2×0.9+3×1.6=14．

根据理解，回答问题。

       云还没铺满天，地上已经很黑，极亮极热的晴午忽然变成了黑夜似的。风带着雨星，像在地上寻找什么似的，东一头西一头地乱撞。北边远处一个红闪，像把黑云掀开一块，露出一大片血似的。风小了，可是利飕有劲，使人颤抖。 一阵这样的风过去，一切都不知怎么好似的，连柳树都惊疑不定地等着点什么。又一个闪，正在头上，白亮亮的雨点紧跟着落下来，极硬的，砸起许多尘土，土里微带着雨气。几个大雨点砸在祥子的背上，他哆嗦了两下。

这段文字节选自名著____，文段中“他哆嗦了两下。”一句中的“哆嗦了两下”属于____短语，其中“两下”的词性是____。从修辞的角度看，文中划线句子属于____。节选文段表达的意思是____。

    One day, a mother crocodile (鳄鱼) and a baby crocodile swam slowly in a river. Suddenly, the mother crocodile saw a monkey, "Oh, a monkey! How nice if I have it for dinner!"

    "My son, can you go and get the monkey for me? I want to eat his heart (心脏)," the mother crocodile said.

    "All right," the baby crocodile answered.

    The baby crocodile swam near the river bank (岸). He shouted at the monkey, “Hey, monkey！Would you like some bananas? There are many banana trees on the other bank of the river"

    "I like them very much. But I can't swim. How can I get there?" the monkey asked.

    "Oh, I can take you there," the baby crocodile said.

    "Really? Thank you very much!" the monkey jumped onto the baby crocodile's back. In the middle of the river, the baby crocodile went into the water. When he came up again, the monkey was wet all over. "Don't do that again, or you'll kill (杀死) me!" the monkey shouted.

    "I know, but I must do that! My mother wants to eat your heart."

    "My heart? 你为什么不早点告诉我? I left it in a tree. We should go back for it!" So_ they went back.

    As soon as they got to the bank, the monkey picked up a big stone (石头) and climbed up onto the tree quickly. He shouted at the baby crocodile, "Don't you want my heart? Well, catch!" The monkey threw the big stone at the crocodile.