问题 探究题

小强同学观察到他所拿的AD钙奶塑料瓶示签上标有“240mL 252g”字样。

(1)请你据此算出瓶中所装牛奶的密度。

(2)通常瓶中的牛奶并没有装满,请你想出一种测出该AD钙奶塑料瓶的容积的方法。

(3)小强还观察到:平时喝牛奶的吸管是一端平,一端尖。请你说明一端做得尖有什么好处?

答案

(1)1.05g/cm3

(2)将AD钙奶塑料瓶中装满水,分次倒入量筒中,读出总体积即为其容积。(其它方案合理即可)

(3)削尖的一端是为了减小受力面积,使用时增大对封口的压强,从而轻松将吸管插入瓶中。

完形填空

Though different educational systems have different purposes, one thing is certain: all students should take part in examinations.

___1___ the English educational system, students take ___2___ very important ___3___. The first is the eleven-plus, which is taken at the age of eleven ___4___ past. At one time the ability ___5___ on the eleven-plus would have determined ___6___ a child stayed in school. ___7___, however, all children continue in “comprehensive”(综合性的) schools, and the eleven-plus determines which courses of study the child will follow. At the age of fifteen or sixteen, the students are tested for the Ordinary Level of the General Certificate(证书) of Education. This examination covers a wide ___8___ of subjects; once students have passed this exam, they are ___9___ to specialize, so that two-thirds or ___10___ of their courses will be ___11___ physics, chemistry, classical language, or ___12___ they wish to study ___13___. The ___14___ examination, at eighteen, covers only the ___15___ of the special subjects. ___16___ the universities, students study only in their concentrated area, and ___17___ students ever venture(冒险) outside ___18___ subject again; ___19___, the English boy or girl is a specialist ___20___ the age of fifteen.

1. A. On  B. In       C. To      D. For

2. A. four       B. three   C. two     D. one

3. A. subjects  B. languages   C. courses       D. examinations

4. A. somewhat      B. or else C. or so   D. or rather

5. A. seen       B. heard  C. shown D. known

6. A. when      B. if C. that     D. how

7. A. But B. Then   C. So      D. Now

8. A. number  B. part    C. range  D. collection

9. A. allowed  B. passed C. forbidden   D. admit

10. A. much    B. many  C. more   D. most

11. A. in  B. of       C. with    D. on

12. A. whenever     B.however      C.whatever D. wherever

13. A. at all costs    B. at the same time      C. at the least   D. at great length

14. A. late      B. later    C. early   D. final

15. A. context B. content         C. book   D. lesson

16. A. Even so       B. Even if      C. Even then   D. Even at

17. A. few      B. no      C. some   D. any

18. A. that      B. their   C. its       D. which

19. A. in any case   B. in all C. in a sense   D. in the end

20. A. of B. from C. at       D. under

名词解释