Native to South America, when peanuts were introduced to Africa by Portuguese explorers early in the sixteenth century they were quickly adopted into Africa's agriculture, probably because of being so similar to the Bambarra groundnut, a popular indigenous plant.

As the cost of wireless service has steadily dropped over the last year and as mobile phones have become increasingly common, many people are finding that they can avoid toll charges on their home phones, using their mobile phones for making long-distance calls at night or on weekends, at a time which many wireless companies provide unlimited airtime for a small monthly fee.

Warning that computers in the United States are not secure, the National Academy of Sciences has urged the nation to revamp computer security procedures, institute new emergency response teams, creating a special nongovernment organisation to take charge of computer security planning.

The passage implies that national policies that rely heavily on economic indicators such as the GDP tend to

The primary purpose of the passage is to

Which of the following best describes the function of the second sentence of the passage (highlight text) in the context of the passage as a whole?

it can be inferred from the passage that advertisers could reduce one of the risks discussed in the last paragraph if they were able to provide

It can be inferred from the passage that one situation in which the boomerang effect often occurs is when consumers

It can be inferred from the passage that the research mentioned in highlight text supports which of the following statements ?

The primary purpose of the passage is to