39. This passage is mainly about ________ .

A. how to work out the metric system

B. what is the metric system

C. how to change other units into the metric system

D. the development of the metric system

(B)

Read the following two advertisements and answer the questions below:

38. Which of the following units does NOT belong to “metric system”?

A. Acre　　　　　　　　　　　　　　　　　　　　　　　 B. Hectare

C. Kilometer　　　　　　　　　　　　　　　　　　　 D. Gram

37. In_________, a committee of scientists worked out “Metric system”.

A. America　　　　　　　　　　　　　　　　　　　　 B. Japan

C. France　　　　　　　　　　　　　　　　　　　　　　 D. Germany

36. Metric system should be used in the world because _______.

A. man measured the distance which is based on the distance from a man’s elbow to the tip of his middle finger

B. the English-speaking countries used their own measurement

C. scientific work needs a unit of measurement

D. it is based on the weight of a grain of wheat an informal measure of weight is used today

34. A. fire　　　　　 　 B. noise　　　　　　 　　 C. balloons　　　　 　 D. flags

33. A. search　　　　 B. look for　　　　　 　 C. look into　　　　　 D. defend

32. A. Instead　　　 B. Therefore　　　　 C. But　　　　　　　 　　 D. So

31. A. He　　　　　 　 B. This　　　　　　 　　　 C. That　　　　　　　 D. It

30. A. a shark　　　 B. a mouse　　　　 　 C. water　　　　　　 　　 D. some noise