问题 选择题

近几年,我国的航天事业成就斐然,“神舟六号”载人飞船已发射成功,“嫦娥”探月工程也在稳步进行中.据科学家预测,月球的土壤中吸附着数百万吨的3He,每百吨3He核聚变所释放出的能量相当于目前人类一年消耗的能量.在地球上,该元素主要以4He的形式存在.下列说法正确的是(  )

A.4He原子核内含有4个质子

B.3He和4He互为同位素

C.3He原子核内含有3个中子

D.4He的最外层电子数为2,所以4He具有较强的金属性

答案

答案:B

阅读理解

阅读理解。

     Boiler rooms are often dirty and steamy, but this one is el.ean and cool. Fox Point is a very new47-unit

living building in South Bronx, one of the city's poorest areas. Two-thirds of the people living there are

formerly (以前) homeless people, whose rent is paid by the government. The rest are low-income families.

The boiler room has special equipment, which produces energy for electricity and heat. It reuses heat that

would otherwise be lost to the air, reducing carbon emissions (碳排放) while also cutting costs.

     Fox Point is operated by Palladia, a group that specializes in providing housing and services to needy,

people. Palladia received support from Enterprise Community Partners (ECP), which helps build affordable

housing by providing support to housing developers.

     ECP has created national standards for healthy, environmentally (环境方面) clever and affordable homes

which are called, the Green Communities Standards. These standards include water keeping, energy saving

and the use of environmentally friendly building materials. Meeting the standards increases housing

construction costs by 2%, which is rapidly paid back by lower running costs. Even the positioning of a

window to get most daylight can help save energy.

     Michael Bloomberg, New York's mayor, plans to create 165,000 affordable housing units for 500,000

New Yorkers. Almost 80% of New York City's greenhouse-gas emissions come from buildings, and 40%

of those are caused, by housing. So he recently announced that the city's Department of Housing and

Preservation and Development (DHPD), whose duty is to develop and keep the city's supply of affordable

housing, will require all its new projects to follow ECP's green standards.

     Similar measures have been taken by other cities such as Cleveland and Denver, but New York's DHPD

is the largest city developer of affordable housing in the country.

1. What is the purpose of describing the boiler room in the first paragraph? [ ]

A. To explain the measures the city takes to care for poor people.

B. To suggest that affordable housing is possible in all areas.

C. To show how the environment-friendly building works.

D. To compare old and new boiler rooms.

2. What is an advantage of the buildings meeting the Green Communities Standards? [     ]

A. Lower running costs.

B. Costing less in construction.

C. Less air to be lost in hot days.

D. Better prices for homeless people.

3. It can be learned from the text that, _____.[ ]

A. New York City is seriously polluted

B. people's daily life causes many carbon emissions in New York City

C. a great number of people in New York City don't have houses to live in

D. some other cities have developed more affordable housing than New York City

4. What is the main purpose of this text? [ ]

A. To call on people to pay more attention to housing problems.

B. To prove that some standards are needed for affordable housing.

C. To ask society to help homeless people and low-income families.

D. To introduce healthy, environmentally clever-and affordable housing.

单项选择题