A. the relationship between people
B. the perception of other people
C. secrets and deceptions of people
D. people's attitudes and characters
A. Draw people's attention to the disadvantages of e-books.
B. Call on people to reject e-books.
C. Criticize schools and business that don't provide e-books.
D. Encourage people to use e-books.
A. Positive
B. Indifferent
C. Cautious
D. Suspicious
A. They are unable to be broken down into harmless products
B. They consume a lot of natural resources
C. They produce harmful gases
D. They are capable of being reused