单选题A The above is the most important aspect B which apes C can be told from more D primitive social groupings.

单选题 Mike has gone to the supermarket but his car's still outside. He ______ by bike.

单选题Which of the following actually prevents dirt and leaves from falling inside the tank?

单选题I noticed that the meals were well ______ what was charged for them.

单选题When we watch a play or a film, we all realize that the characters are sometimes ______. A. imaginative B. imaginable C. imagined D. imaginary

单选题The government is believed to be considering ______ a law making it a crime to import any kind of weapon.

单选题根据读音，选择合适的答案（ ）

单选题 Questions6-9 are based on the conversation you have just heard.

单选题Cindy: Thanks for all your help.Joe: No problem. Have a good day!Cindy: ______ Thanks again. Bye.

单选题此题为音频题

单选题 The fertile land of the Nile delta is being eroded along Egypt's Mediterranean coast at an astounding rate, in some parts estimated at 100metres per year. In the past, land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought dawn to the delta by the River Nile, but this is no longer happening. Up to now, people have blamed this loss of delta land on the two large dams at Aswan in the south of Egypt, which hold back virtually all of the sediment that used to flow down the river. Before the dams were built, and the Nile flowed freely, carrying huge quantities of sediment north from Africa's interior to be deposited on the Nile delta. This continued for 7,000 years, eventually covering a region of over 22,000 square kilometres with layers of fertile silt. Annual flooding brought in new, nutrient-rich soil to the delta region, replacing what had been washed away by the sea, and dispensing with the need for fertilizers in Egypt's richest food-growing area. But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought, most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta. Now, however, there turns out to be more to the story. It appears that the sediment-free water emerging from the Aswan dams picks up silt and sand as it erodes the river bed and banks on the 800-kilometre trip to Cairo. Daniel Jean Stanley of the Smithsonian Institute noticed that water samples taken in Cairo, just before the river enters the delta, indicated that the river sometimes carries more than 850 grams of sediment per cubic metre of water—almost half of what it carried before the dams were built. 'I'm ashamed to say that the significance of this didn't strike me until I had read 50 or 60 studies,' says Stanley in Marine Geology. 'There is still a lot of sediment coming into the delta, but virtually no sediment comes out into the Mediterranean to replenish the Coastline. So this sediment must be trapped on the delta itself.' According to Siegel, international environmental organizations are beginning to pay closer attention to the region, partly because of the problems of erosion and pollution of the Nile delta, but principally because they fear the impact this situation could have on the whole Mediterranean coastal ecosystem. But there are no easy solutions. In the immediate future, Stanley believes that one solution would be to make artificial floods to flush out the delta waterways, in the same way that natural floods did before the construction of the dams. He says, however, that in the long term an alternative process such as desalination may have to be used to increase the amount of water available, 'In my view, Egypt must devise a way to have more water running through the river and the delta,' says Stanley. Easier said than done in a desert region with a rapidly growing population.

单选题Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning. A. observed B. preserved C. monitored D. nurtured

单选题There are two major problems linked with atomic power plants, ______ the first concerns nuclear waste.

单选题During their first teacher training year, the students often visited schools for the ______ of lessons.

单选题We wish that you ______ such a lot of work, bemuse we know that you would have enjoyed the concert.

单选题Steve looked at the envelope and recognized Jenny’S handwriting_________ .

单选题I would rather I ______ her three years ago.

单选题Do you often talk to each ______ in English?

单选题I was told that the woman was indifferent ______ hardships and dangers.