身為醫(yī)生，他有很好的聲譽(yù)。

When scientists scan the global horizon, over?fishing, loss of species habitat, water shortage, climate change, and invasive species seem to be the biggest threats to the earth. Then what will our world be like in 2050?

There are two features in the growth of world population. First, the United Nations estimates that by 2050, the population of European countries will decrease from the current 0.72 billion to 0.63 billion. Second, the population in developing countries is growing rapidly. By 2050, the population of Africa is expected to reach 1.8 billion, 0.9 billion more than its present population.

Global warming will become more and more serious. A recent research report published by the United Nations indicates that it's quite possible that the Earth's temperature is rising well above the previous estimate. Such an outcome would have severe consequences. For example, a research team from the University of Colorado used satellite data to estimate that the ice sheet will lose up to 48 cubic (立方的) miles by 2050. Ice shelves in the Antarctic will have decreased by more than 7,200 square miles in the next forty years.

There will be more severe water shortage. Africa's rivers face dramatic change that will leave a quarter of the continent severely short of water by the middle of the century, according to a global warming study. Even modest decreases in rain in western Africa will see rivers lose as much as 80% of their water.

Today there are 620 million private cars worldwide. With current growth trends, that number is expected to reach three billion worldwide by 2050. If we continue to burn fossil fuels at current rates, levels of carbon dioxide in the atmosphere will reach 550 ppm (parts per million)—double pre?industrial levels—by around 2050. This will increase global temperatures by between 1.4℃ and 4.8℃ by 2050, and sea levels will rise by between 0.09 meters and 0.78 meters.

We should honor those who have made great ___________(貢獻(xiàn)) to the society.

– Do you doubt ___ she has passed the exam?

– I’m not doubtful at all ___ she has passed all the exams.

A. that; whether 　 　 B. whether; that　 C. that; that　 　　 D. whether; whether

Albert Einstein, ________ life had once been very hard, was given the Nobel Prize for physics in 1921

　 A．of whom　　 B．for whom　　 C．for whose　 D．in whom

.I forgot __________________________(提前提醒你)because I was really occupied with the work.(advance)

Everyone in the village hoped that he would _______ after a few days’ treatment.

A. pick up 　　　 B. come up 　　　　 　 C. keep up 　　　 　 D. make up

--- How did you manage to get such a nice old painting?

---Quite _______.

　 A. by accidents　 B. by a chance　 C. by accident　 D. by incident

On the Internet, we can be any person and do anything that we can’t in _________ (現(xiàn)實(shí)).