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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 Computer 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