What is Jack’s purpose of calling？

A．To show the way genetic testing works.

B．To indicate the relation between genes and Huntington's disease.

C．To reveal the influence of environmental factors on genes.

D．To introduce genetic testing and its functions.

A．To compare different energy sources.

B．To introduce a new concept of zero carbon gasoline.

C．To explain why gasoline is important to us.

D．To discus how to solve the problem of global warming.

A．To define what Alzheimer"s disease is.

B．To tell people how to avoid Alzheimer"s disease.

C．To provide information related to a book on dementia.

D．To persuade people to buy medicine for dementia.

A. To address both Houses of Parliament.

B. To enjoy a glittering state banquet.

C. To honor the unknown soldier.

D. To meet Prince Charles and his wife.

A．To review the impact of women becoming high earners．

B．To contemplate the philosophy underlying individualism．

C．To examine the trend of young people living alone．

D．To stress the rebuilding of personal relationships．

A．To review the impact of women becoming high earners．

B．To contemplate the philosophy underlying individualism．

C．To examine the trend of young people living alone．

D．To stress the rebuilding of personal relationships．

A.To promote understanding between vendors and constumers.

B.To argue that the Internet generation still cares about their privacy.

C.To persuade people not to constantly update their status on Facebook.

D.To urge vendors to be more privacy-friendly to make a greater profit.

A．To change the behavior. or the thinking of its readers towards body-image.

B．To convince people that it is harmful to be obsessed with superficial beauty.

C．To persuade people to pursue more valuable things.

D．To analyze why people pay so much attention to physical appearance.