RM80型清筛机在风制动压力高于（）bar时，液压驱动会自动卸荷。A

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问题单项选择题

RM80型清筛机在风制动压力高于（）bar时，液压驱动会自动卸荷。

A、3.2

B、3.0

C、1.6

D、1.0

答案

参考答案：C

单项选择题

The Intergovernmental Panel on Climate Change (IPCC) was set up in 1988 to assess information on climate change and its impact. Its Third Assessment Report predicts global temperature rises by 2100 of between 1.4°C and 5.8°C. Although the issue of the changing climate is very complex and some changes are uncertain, temperature rises are expected to affect countries throughout the world and have a knock-on effect with sea-level rises.Scientists have argued about whether temperature rises are due to human activities or due to natural changes in our environment. The IPCC announced in 2001 that "most of the warming observed over the last 50 years is likely to be attributable to human activities". This was a more forceful statement than in 1996 when the Second Assessment Report stated that there was a "discernible human influence on the climate" which was the first time they had concluded such a link. Many experts believe the faster the climate changes, the greater the risk will be.Key points of the projections for climate change globally include that by the second half of the 21st century, wintertime rainfall in the northern mid to high latitudes and Antarctica will rise, that meanwhile Australia, Central America and southern Africa are likely to see decreases in autumn precipitation, that some land areas in the tropics will see more rainfall, and that there will generally be more hot days over land areas.

According to the author, climate researchers________.

A．are quite sure about why it’s getting hotter and hotter

B．declared that we humans are the cause why it’s getting hotter

C．have discussed the possible causes why it’s hotter

D．have claimed that changes in nature are the roots of hot days

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Jeans are very popular especially with teenagers. It’s said that the material came originally from Nimes, a city in France. These jeans were particularly created for the sailors, who loved wearing jeans very much. These jeans could be worn when wet and it could even be rolled over with ease. This was particularly useful when the sailors were busy with their everyday work.

Our favorite pair of blue, jeans was originally worn by workers particularly during World War II. Perhaps the strong and durable(耐用的) look made these blue jeans popular among all the factory workers. A strange thing that can be noticed happened in the early period of the 1950s when blue jeans worn by teens were considered to be a form of being against others. Besides, adults who wore blue jeans were not allowed to enter a movie theatre. It was only during the 1960s that blue jeans were accepted as a fashion trend in the United States of America. Movie stars wore them in films and in public. Many young people follow them.

The different looks of the regular blue jeans which are enjoyed by people were introduced by the mid 1950s. It was Donald Freeland who gave jeans a whole new look and brought it to the front. Originally, jeans were always worn loose. At first, jeans worn by men had the zipper(拉链)on the front. However, for women, it was on the side. By the late 1960's , the zipper finally was on the front side for women as well.

Today, there are many new designs that are being created by fashion designers to meet the increasing demands from jean lovers! A pair of basic blue jeans, however, is one such piece of clothing that will never go out of fashion! When you open one's cupboard, there is always one pair of jeans one likes best.

小题1:The sailors originally were interested in wearing jeans because jeans .

A．could give them a pleasant look

B．were convenient and easy to use