题目内容
We only ________ a few words ________ we were in a hurry．
- A.changed; but
- B.exchanged; because
- C.changed; because
- D.exchanged; but
In the 1960s Professor Bolin predicted that the “greenhouse effect”, caused by an increase in the amount of carbon dioxide (CO2) in the atmosphere, would lead to important changes in the Earth’s climate. At the time his prediction were regarded as science fiction. But it is now gradually agreed that the amount of carbon dioxide in the atmosphere will double from 0.03% to 0.06% in the next 50 years and that temperatures worldwide will rise by 2°Celsius.
Although a temperature rise of 2°may not seem significant, the local effects may be much greater: in polar regions a rise of 10°by 2025 is expected and in Northern Europe a rise of 4°. Indeed the first effects were expected to be felt before the end of the 20th century,
But how does the “greenhouse effect”operate and why should such a tiny proportion（比例）of CO2 have such a harmful effect? When living creatures breathe out or when things are burned, CO2 enters the atmosphere. Until recently all of this was absorbed by plants, which converted it back into oxygen.
However, the balance of nature has been disturbed. In power stations, in factories and in our cars, we are burning more and more fossil fuels( coal, oil and natural gas ) and this produces huge quantities of CO2---18 billion tons of it enter the atmosphere every year. Added to this, the destruction of forests means that less CO2 can be converted into oxygen by plants. So, the amount of CO2 in the atmosphere is increasing every year.
【小题1】Which of the following statements is true according to the passage?
| A．Professor Bolin’s predictions were taken seriously in the first place |
| B．Only a small portion of the atmosphere consists of carbon dioxide |
| C．No changes in climate will become noticeable for 50 years or more |
| D．The rise in temperature will probably be 2 degrees in every part of the world. |
| A．Carbon dioxide is produced when we breathe |
| B．Carbon dioxide is produced when we burn things |
| C．More forests are destroyed and more fossil fuels are burned |
| D．The global temperature keeps rising |
| A．the problem of the rising global temperature |
| B．the problem of increasing population worldwide |
| C．the problem of decreasing population worldwide |
| D．the problem of air pollution |
| A．play | B．move | C．manage | D．function |
Language is always changing. In a society where life continues year after year with few changes, the language does not change either. The earliest known languages had difficult grammar but a small, limited vocabulary. Over the century, the grammar changed, and the vocabulary grew. For example, the English and Spanish people who came to America during the sixteenth century gave names to all the new plants and animals they found. In this way, hundreds of new words were introduced into English and Spanish vocabularies. Today life is changing very fast, and language is changing fast too.
There are several major language families in the world. Some scientists say there are nine main families, but other scientists divide them differently. The languages in each family are connected, and scientists think that they came from the same parent language. About 3 percent of the people in the world speak languages that are not in these major families.
【小题1】The early language had ________.
| A．a lot of problems | B．words and easy grammar |
| C．words but no grammar | D．grammar but not many words |
| A．stay exactly the same |
| B．change a great deal |
| C．change only a little |
| D．ask more words and drop some grammar |
| A．languages change fast |
| B．languages really don't want to change |
| C．language really with changes in society |
| D．Spanish and English change |