Why is “plankton” mentioned in the second paragraph?

The word “immense” in paragraph 3 is closest in meaning to ______.

According to the passage, a regional university rector in Germany is elected by _____.

The word "perish" in paragraph 3 is closest in meaning to ______.

Which of the following can be inferred about Moore's poems?

According to the passage, some Americans choose to live in the country because ___.

It can be inferred from the passage that a soil sample with little or no clay in it ______.

All of the following statements are mentioned EXCEPT ______.

Why do people say that African women’s lives are hard?

Smallpox was the first widespread disease to be eliminated by human intervention. Known as a highly contagious viral disease, it broke out in Europe, causing the deaths of millions of people until the vaccination was invented by Edward Jenner around 1800. In many nations, it was a terror, a fatal disease until very recently. Its victims suffer high fever, vomiting and painful, itchy, pustules that left scars. In villages and cities all over the world, people were worried about suffering smallpox.In May, 1966, the World Health Organization (WHO), an agency of the United Nations was authorized to initiate a global campaign to eradicate smallpox. The goal was to eliminate the disease in one decade. At the time, the disease posed a serious threat to people in more than thirty nations. Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated but eleven years after the initial organization of the campaign, no cases were reported in the field.The strategy was not only to provide mass vaccinations but also to isolate patients with active smallpox in order to contain the spread of the disease and to break the chain of human transmission. Rewards for reporting smallpox assisted in motivating the public to aid health workers. One by one, each small-pox victim was sought out, removed from contact with others and treated. At the same time, the entire village where the victim had lived was vaccinated.By April of 1978 WHO officials announced that they had isolated the last known case of the disease but health workers continued to search for new cases for additional years to be completely sure. In May, 1980, a formal statement was made to the global community. Today smallpox is no longer a threat to humanity. Routine vaccinations have been stopped worldwide. 

Which of the following is the best title for the passage?

Sign language is said to be very picturesque and exact and can be used internationally EXCEPT for____________