【解析】选D。细节理解题。由第一段最后一句As in California, they formed small pockets of Chinese culture that were known as"Chinatowns". 看出他们在加州建立了自己的文化区域。

4. According to the passage, Chinese immigrants_______.

A. lost their hopes of returning to their country

B. tried to find a place in the larger society

C. went on with their own traditions in spite of social changes

D. were free to take whatever jobs they like

【解析】选C。细节理解题。由第二段第二句中的". . . foreigners in the United States, keeping their cultural traditions, living in the larger society in which they existed. "看出他们继续保持自己的传统。

5. What is the main idea of this passage?

A. Chinatowns experienced great changes after gold was discovered in 1848.

B. Chinese Exclusion Acts brought great sufferings to the Chinese laborers.

C. Chinese laborers were cruelly exploited by the white people.

D. Chinese immigration to America resulted in the forming of Chinatowns.

【解析】选D。主旨大意题。从第一段最后一句和第二段看出本文是在讨论Chinatowns的形成。

Los Angeles Invites You To Experience The All-Glass Skyslide

　　A new tourist attraction will be part of the amazing Los Angeles, allowing visitors to slide between the 70th and 69th floors of the U. S. bank tower. Suspended more than 300 meters above downtown, the Skyslide(天空滑梯)is 14 meters in length and 1. 2 meters wide.

　　This Skyslide was made entirely from glass, which only adds to the excitement. The Skyslide is part of a major overhaul of the building, done by Singapore-based developers OUE and US architecture firm Gensler.

　　The $50 million project also includes two observation decks(观景台), allowing tourists to enjoy local landmarks, neighborhoods, and various other places of interest in Los Angeles.

　　But that sounds like a bit much to us; $50 million? The U. S. bank tower is the tallest building in California, and the 12th tallest in the US, which should explain why this building was chosen instead of others.

　　It will cost only $25 for entering the observation decks. If you want to experience a thrilling ride on the Skyslide, you have to pay an additional $8 ticket; not much, really. Planned to be opened on June 25, 2016, with reservations possible on the skyscraper's website, the $50 million project will probably get a lot of attention. Who is the first?

【语篇概述】人人都坐过滑梯, 但你尝试过在300多米的高空, 乘坐透明玻璃滑梯的刺激感受吗? 在美国洛杉矶联邦银行大厦的外围, 有一个特殊的玻璃滑梯, 全封闭全透明, 等你来体验其中的惊险!

6. What does the passage mainly talk about?

A. An introduction about the All-Glass Skyslide in Los Angeles.

B. The U. S. bank tower is the tallest building in California.