斜巷由上口往下口松车时，应（）松车，严禁不带电（）。

Mike always loves ships. When he was older, he said, “I’m going to be a soldier.” But his eyes were not very ___1_____, and he did not get in.

　　Then he said,“I’m going to   2  a small boat and I’m going around the world.”But boats were very expensive, and Mike did not have enough   3   .

　　Last summer Mike found a swimming   4    near his house. The lessons did not cost very   5   , and Mike began going to the school at every end of the week and having   6  . Now he is a good swimmer.

　　Last week a little boy said to him,“You’re a very good swimmer. How do   7  learn to swim so well?”

　　“I’m not good at all,”Mike said and he smiled.“  8  I’m in the water, I say to myself, There are   9  fishes behind me! Then I’m very afraid, and I    10   quickly.”

(       ) 1. A. big        B. beautiful   C. good         D. strong

(       ) 2. A. buy        B. make     C. borrow        D. draw

(       ) 3. A. food       B. work      C. time          D. money

(       ) 4. A. park       B. school     C. farm          D. factory

(       ) 5. A. much      B. little       C. many         D. any

(       ) 6. A. meals      B. lessons      C. talks         D. games

(       ) 7. A. I         B. they        C. we         D. you

(       ) 8. A. If         B. When       C. Though      D. Where

(       ) 9. A. interesting  B. nice       C. dangerous     D. different

(       ) 10. A. run       B. jump      C. swim         D. fly

命题“若f（x）是奇函数，则f（-x）是奇函数”的否命题是（　　）

A．若f（x）是偶函数，则f（-x）是偶函数

B．若f（x）不是奇函数，则f（-x）不是奇函数

C．若f（-x）是奇函数，则f（x）是奇函数

D．若f（-x）不是奇函数，则f（x）不是奇函数

正常气管隆突的分叉角度约为（）

A.45°～75°

B.55°～85°

C.65°～90°

D.60°～85°

E.60°～75°

如图所示，质量相同的两木块M、N，中间固定一轻弹簧，M放在粗糙的水平面上，N放在光滑的水平面上，用力将两物体靠近使弹簧压缩，此时弹簧的弹力大于M所受到的最大静摩擦力，当松手后两物体被弹开的过程中，不计空气阻力，则对两木块，有 （   ）

A．动量守恒、机械能守恒

B．动量守恒、机械能不守恒

C．动量、机械能都不守恒

D．加速度大小任意时刻相等

普通话声母共有（）。

A.20个

B.21个

C.22个

D.23个