[单项选择]Which of the following CANNOT be inferred from the passage


A. We are a walking, living, breathing record of our ancestors.
B. Many American slaves did not know who their ancestors were.
C. An adopted child generally lacks enough information to prove his identity.
D. Molecular genealogy can be used to prove a relationship between individuals.

[单项选择]Which of the following cannot be inferred from the passage


A. Many disabled people may remain single for their whole life.
B. The public tends to look down upon the disabled people.
C. The disabled people feel inferior to those surrounding them.
D. Discriminatory laws prevent the disabled from mixing with others.

[单项选择]Which of the following CANNOT be inferred from the passage


A. We are a walking, living, breathing record of our ancestors.
B. Many American slaves did not know who their ancestors were.
C. An adopted child generally lacks enough information to prove his identity.
D. Molecular genealogy can be used to prove a relationship between individuals.

[单项选择]Which of the following can be inferred from the last paragraph

[单项选择]Which of the following can be inferred from the passage about the technology employed in optical computing


A. The technology is more expensive to develop than the technology that was required in electronic computing.
B. The search for technology necessary for all-optical computing is considered unfeasible and has been largely abandoned.
C. Optical computers systems that rely on digital partitioning algorithms in tandem with error-correction codes are considered hybrid technology.
D. The technology necessary for digital optical computing appears within closer reach than the technology for analog optical computing.
E. (E) The most feasible version of optical computing at present is a synthesis of electronic and optical technology.