The main idea of the passage is best expressed by which of the following _____

A:Business organizations should not spend so much money to attract new customers B:Maintaining customers' patronage is the most important to business organizations' C:Customers are kings D:Organizations should pay more attention to the benefit of their customers

The idea (that) learning is (a) lifelong process (has expressed) by philosophers and educationalists (throughout) the centuries.（　）

A:that B:a C:has expressed D:throughout

Thoughts are expressed（　）words.

A:by all means B:by no means C:by the way D:by means of

Thoughts are expressed ______ words.

A:by all means B:by no means C:by the way D:by means of

What is the main idea expressed in the passage

A:Women played an important role in military hospitals during the Revolutionary war. B:The Continental Army was successful in teaching women to fire cannons. C:The services of women on committees of safety were crucial in winning the war. D:Women were active in combat during the Revolutionary war.

Which of the following is NOT an opinion expressed by Magdalena Smith

A:Grades should be abolished. B:Grades impose subjective standards of success. C:Students should be able to learn without worrying about grades. D:Competition may discourage students from pursuing subjects such as drama and art.

The maximum number of data that can be expressed by 8 bits is（）

A:64 B:128 C:255 D:256