公共英语（PETS）三级模拟题（六）
Section IV Writing
( 40 minutes )
You should write your responses to both parts on ANSWER SHEET 2.
Part A
66. Write a note to explain why you were absent from the night class.
Part B
67. For this part, you are required to write a composition based on the following table of The Brain and the Computer. Your composition should be no less than 150 words.
The Brain and the Compute
| Brain | Computer |
Size | one tenth of a cubic foot | hundreds of cubic feet of space |
Electrical energy used | 25 watts of electrical power | 100,000 watts of electrical power |
Structure of cells | directly connected to many other cells | unconnected cells like a cell of pigeonholes (鸽巢分类架) |
Capacity | between 10 billion and 100 billion items of information | a few billion items of immediately accessible information, nothinking capacity |