Gambling is not Las Vegas’ only attraction. More than eight million tourists visit every year, and only about 60% of them participate in casino gambling.

Question

BlackTom AI · Accepted Answer

An authoritative primary source listing visitor counts and participation by attraction is the best way to verify the claim that “more than eight million tourists visit every year, and only about 60% of them participate in casino gambling.”

1) Relevant knowledge points and concepts
- Primary vs. secondary sources: Primary sources (official statistics, government or tourism board reports) directly report measured data; secondary sources interpret or analyze those data.
- Relevance and specificity: A source must directly provide annual visitor numbers and breakdowns by activity (casino gambling vs. other attractions) to support the claim.
- Currency and authority: Up-to-date, official figures from a tourism board are generally more authoritative and reliable than a general book or an analysis focused on odds.

2) Step-by-step reasoning
Step 1 — Identify what needs to be supported: two numeric claims — annual tourist volume (>8 million) and the proportion who gamble (~60%).
Step 2 — Evaluate candidate sources for directness: does the source report visitor counts and participation rates?
Step 3 — Compare options:
- Option A: “A statistical meta-analysis of gambling odds which mentions the number of tourists who gamble” — likely focuses on odds and player behavior. If it only mentions tourist numbers incidentally, it is not the primary, most reliable, or most up-to-date source for overall visitor counts or participation rates.
- Option B: “Visitor numbers to various tourist attractions (including gambling casinos) from the Las Vegas Tourism Board website” — an official tourism board report will typically publish annual visitor totals and sometimes breakdowns by attraction type (casino attendance). This directly addresses both parts of the claim and is a primary, authoritative source.
- Option C: “A book about the history of Las Vegas with a chapter on tourism and gambling” — useful contextually but often not current or precise on annual statistics and participation percentages.

3) Why the correct answer is correct
The Las Vegas Tourism Board’s visitor numbers are primary, specific, and authoritative evidence for both the total number of tourists and the proportion engaging in casino gambling. They are more direct and reliable than a meta-analysis focused on odds or a history book.

4) Why the other options are incorrect
Option A is tangential and likely not focused on annual visitor totals; Option C is secondary and may be outdated or lacking specific breakdowns.

Conclusion: The best supporting source is the Las Vegas Tourism Board visitor numbers (Option B), which matches the provided correct answer.

Gambling is not Las Vegas’ only attraction. More than eight million tourists visit every year, and only about 60% of them participate in casino gambling.单项选择题

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