Why does the author mention Lincoln's axe？A．To tell people that a simple tool can be repai

Why does the author mention a dog's bark？ ______

A．To exemplify poor memory.

B．To analyze a type of interruption.

C．To compare human memory with dog's memory.

D．To illustrate the lack of efficiency of rote rehearsal.

Why does the author mention the discovery of AIDS in the last paragraph？

A．To give an example of an incurable disease.

B．To illustrate the importance of preventative methods.

C．To exemplify a disease prevalent in the wealthy nations.

D．To use it s comparison to quickly spotted diseases.

Why does the author mention the peacock's tail feathers？

A．To contrast the peacock's appearance with that of moths.

B．To show that not all traits are naturally selected.

C．To provide an example of a sexually selected trait.

D．To demonstrate the power of environmental pressures.

Why does the author mention the high infant death rates in the last two paragraphs？

A．To illustrate the inefficiency of the Government.

B．As the data of Helen Christensen's research project.

C．To illustrate the difficult pregnancy and motherhood.

D．As the result of mothers' absent-mindedness and tiredness.

Why does the author mention the peacocks tail feathers？

A．To contrast the peacock"s appearance with that of moths.

B．To show that not all traits are naturally selected.

C．To provide an example of a sexually selected trait.

D．To demonstrate the power of environmental pressures.

Why does the author mention the fire extinguisher hose in paragraph 2？

A．To emphasize the unsafe working conditions

B．To show the manager's leadership skills

C．To illustrate the factory's modem technology

D．To explain how the fire was eventually put out

Why does the author mention Tilbury Town and Spoon River？

A．To give credit to two great writers.

B．To provide examples of important literary places.

C．To suggest similarities between Brooks's style. and that to other authors.

D．To encourage the reader to read Robinson and Masters.

Why does the author mention Tilbury Town and Spoon River？

A．To give credit to two great writers,

B．To provide examples of important literary places.

C．To suggest similarities between Brooks's style. and that to other authors.

D．To encourage the reader to read Robinson and Masters.

Why does the author mention "the Louisiana Purchase"？

A．To demonstrate how the westward expansion of the United States came about.

B．To illustrate Washington's contribution to the evolution of the United States.

C．To explain why Jefferson was chosen to be one of the presidents on Mount Rushmore.

D．To show why Jefferson's inclusion on Mount Rushmore was a contentious issu