New Yorkers were shocked in early December when a creature as big as a school bus     1     (surface) from the Hudson River. Over the next three days,     2    humpback whale (座头鲸) swam by several popular tourist    3    (destination), where a journalist took photos of the animal seemingly waving its tail at Lady Liberty.

Scientists say NYC0089, which hasn’t been spotted in several weeks, has likely returned to deeper waters south of the Hudson. Still, the    4    (frequent) of whale sightings in the broader area has gone up rapidly in recent years.

“With these numbers increasing     5    (sharp), it’s not surprising that you’re seeing them in some unusual places, says Brown—a biologist. ”Including the Hudson River and Staten Island.

Scientists say the    6    (rise) whale sightings are likely related to purer water and a brimming buffet of Atlantic menhaden, a fish favored by humpbacks, resulting    7    . landmark environmental regulations    8    (pass) in the 1970s as well as New York city cleanup efforts.

“Seeing more whales in this areas shows that the waters are cleaner    9    there’s more food here for these whales,” Brown says.“It is a sign that what we’ve been doing     10    (work), so we need to keep doing that — and more — to protect these species.”

The global tourism industry is developing     1     (quick). In 2017, it contributed eight trillion dollars to the economy, and accounted for 10 percent of employment worldwide.

Americans used to be     2     biggest movers in the industry. Now it's the Chinese. Last year, more Chinese people     3     (travel) and spent more money doing so than any other nationality.

    4       middle classes get wealthier in emerging-market(新兴市场)countries, their travel budgets grow. The number of Indian travelers is also rising, with countries like Jordan, Australia and Israel,     5     (make) it easier for Indians to get visas.

Although only seven percent of Chinese citizens have     6     (passport), by 2030, Chinese trips will account for around a quarter of all international tourism.

Thailand is the top international destination for Chinese travelers. Mexico is the number one     7     (choose) for American people. Europeans, meanwhile, tend to stay in Europe, accounting for around 90 percent of nights     8     (spend) by tourists in the EU.

Tourism is increasing in most areas of the world,     9     one remarkable exception. Travel bans on people from Muslim countries, more visa checks and a     10     (strong) dollar have made the United States less popular with international visitors.