Hướng dẫn và trắc nghiệm nghe toefl itp thuộc 20 câu sau - Mã 99013134

31. What is the conversation mainly about?

How to care for precious metals.

The value of precious metals.

A standard unit for measuring weight.

Using the metric system.

32. How was the weight used?

To observe changes in the atmosphere.

To check the accuracy of scales.

To measure amounts of rainfall.

To calculate the density of other metals.

33. Why was it necessary to replace the old standard weight?

Someone spilled water on it.

It was made of low quality metal.

The standard for measuring had changed.

Someone lost it.

34. What does Dr. Thomas probably think about the cost of the new weight?

It is a small amount to pay for so much precious metal.

It is too high for such a light weight

It is reasonable for an object with such an important function.

It is difficult to judge the value of such an object.

Hướng dẫn và trắc nghiệm nghe toefl itp thuộc 20 câu sau – Mã 99013134