1 . 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

Xiechi Lake, also known as Yuncheng Salt Lake in China’s Shanxi Province,     1     (become) popular on social media websites in the past few years.

Now, China wants to transform that online     2     (popular) into real-life tourism. “As the Chinese ‘Dead Sea’, floating here is     3     unforgettable experience, and one you can’t find anywhere else,” reads a tourism advertisement     4     (sponsor) by the Yuncheng Salt Lake Tourism Development Company. Yuncheng Salt Lake is a sulfate (硫酸盐) lake. “If the sulfate in your water is greater than the calcium (钙), all the calcium is used up,     5     leaves you with large amounts of sulfate and you have a sulfate lake,” explains geography professor Bernie Owen. Xiechi is also a “closed basin” lake,     6     (mean) it doesn’t flow out to a river or ocean, which explains how its salt content stays so high. It is possible for salt lakes to freeze over, although not as     7     (quick) as other lakes — after all, think about what happens when we spread salt over icy roads. Saltwater freezes at     8    (low) temperatures than fresh water.

In an effort     9     (boost) Xiechi Lake’s international profile, China is reportedly taking steps to get it recognized     10     a UNESCO World Heritage site.

2 . Top universities for employability 2021 in USA

California Institute of Technology

The California Institute of Technology, founded in 1891, is one of the best private universities in the world, ranking 9 in National Universities. Its setting is suburban and the campus size is 124 acres. The student population is tiny compared with other colleges with just over 1,000 undergraduates and 1,200 postgraduates (2021 ). Students are admitted on the basis of strong maths, science and engineering skills and interest. Some of them may get high scholarship.

Tuition and fees: $58,680(2020-2021)

University of Pennsylvania

The University of Pennsylvania is a private research university that was founded in 1740 in Pennsylvania, USA. It has a total undergraduate enrollment of 9,872(fall 2021). Penn is the fourth-oldest institution of higher education in the United States, and is one of several institutions that claim to have been the first university in America. University of Pennsylvania is ranked number 4 in National Universities.

Tuition and Fees: $ 57,770(2020-2021)

Columbia University

For more than 260 years, Columbia university has been a leader in higher education in the nation and around the world. The oldest private institution recognizes the importance of its location in New York City and seeks to link its research and teaching to the vast resources of a great metropolis. It has a total undergraduate enrollment of 6,170(fall 2021) and is the 5th oldest in the United States. It is ranked number 11 in National Universities.

Tuition and Fees: $53,000(2020-2021)

University of Chicago

University of Chicago is a private institution that was founded in 1890. It has a total undergraduate enrollment of 6,989(fall 2021). In an urban setting, the campus size is 217 acres. University of Chicago has a reputation for devotion to academic scholarship and its ranking is number 6 in National Universities.

Tuition and Fees: $49,298(2020-2021)

1. What is special about California Institute of Technology?

A．It is the oldest university in America.

B．It is a small but well-known university.

C．It offers the highest academic scholarship.

D．It only admits international talented students.

2. Which university can you apply to if you want to pay less tuition and fees?

A．University of Chicago.	B．Columbia University.
C．University of Pennsylvania.	D．California Institute of Technology.

3. What do the four universities have in common?

A．They are all built in urban areas.	B．They are all small schools in size.
C．They are all private universities.	D．They are all ranked top 10 in the USA.