[单项选择]The urban ambient quality in some cities was improved ______a certain extent.

[单项选择]Can you give me some advice ______ how I can improve my English
A. in
B. at
C. on
D. for

[单项选择]

Some cities have planned their transportation systems for ear owners. That is what Los Angeles did. Los Angeles decided to build highways for cars rather than spending money on public transportation.
This decision was suitable for Los Angeles. The city grew outward instead of upward. Los Angeles never built many tall apartment buildings. Instead, people live in houses with gardens.
In Los Angeles, most people drive cars to work. And every car has to have a parking space. So many buildings where people work also have parking tots.
Los Angeles also became a city without a Central Business District (CBD). If a city has a CBD, crowds of people rush into it every day to work. If people drive to work, they need lots of road space.
So Los Angeles developed several business districts and built homes and other buildings in between the districts. This required more roads and parking spaces.
Some people defend this growth pattern. They say Los Angeles
A. there is no public transportation system
B. more money is spent on highways for cars
C. more money is spent on public transportation systems
D. public transportation is more developed than in other cities

[单项选择]According to some recent reports, the urban masses, particularly middle-class women, are continuing their spirited ______ of new products.
A. assumption
B. conception
C. consumption
D. recognition

[单项选择]In some cities of North China, the noise pollution is as pronounced as that in Tokyo.
A. contemptuous
B. contagious
C. conspicuous
D. contemplated

[单项选择]Some cities have passed laws that allow coal and oil______only if their sulfur content is low.
A. burning
B. to burn
C. being burned
D. to be burned