TASK DEFINITION: This task is about reading the given passage and construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) it is answerable from the passage, (iii) its answer is unique (iv) its answer is a continuous text span from the paragraph. Avoid creating questions that (i) can be answered correctly without actually understanding the paragraph and (ii) uses same words or phrases given in the passage.
PROBLEM: During the years 1940-1955, the rate of decline in the U.S. death rate accelerated from 2% per year to 8% per year, then returned to the historical rate of 2% per year. The dramatic decline in the immediate post-war years has been attributed to the rapid development of new treatments and vaccines for infectious disease that occurred during these years. Vaccine development continued to accelerate, with the most notable achievement of the period being Jonas Salk's 1954 development of the polio vaccine under the funding of the non-profit National Foundation for Infantile Paralysis. The vaccine process was never patented, but was instead given to pharmaceutical companies to manufacture as a low-cost generic. In 1960 Maurice Hilleman of Merck Sharp & Dohme identified the SV40 virus, which was later shown to cause tumors in many mammalian species. It was later determined that SV40 was present as a contaminant in polio vaccine lots that had been administered to 90% of the children in the United States. The contamination appears to have originated both in the original cell stock and in monkey tissue used for production. In 2004 the United States Cancer Institute announced that it had concluded that SV40 is not associated with cancer in people.

SOLUTION: When was the Polio vaccine created?

PROBLEM: According to China daily. Fifteen years after the satellite system was launched, it is now generating $31.5 billion for major companies such as China Aerospace Science and Industry Corp, AutoNavi Holdings Ltd, and China North Industries Group Corp.

SOLUTION: How long ago was the BeiDou Satellite System first launched?

PROBLEM: Israel is served by two international airports, Ben Gurion International Airport, the country's main hub for international air travel near Tel Aviv-Yafo, Ovda Airport in the south, as well as several small domestic airports. Ben Gurion, Israel's largest airport, handled over 12.1 million passengers in 2010. On the Mediterranean coast, Haifa Port is the country's oldest and largest port, while Ashdod Port is one of the few deep water ports in the world built on the open sea. In addition to these, the smaller Port of Eilat is situated on the Red Sea, and is used mainly for trading with Far East countries.

SOLUTION:
What is the country's main hub for international air travel?