1 . Directions: After reading the passage below, fill in the blanks to make the passage coherent and grammatically correct. For the blanks with a given word. fill in each blank with the proper form of the given word; for the other blanks, use one word that best fits each blank.

Using renewables seems to cut carbon more than nuclear. Nations that embraced renewable forms of energy have significantly cut their carbon emissions, but     1     pursuing nuclear power have failed to do so, researchers have found.

Nuclear and renewables are seen as two key ways for governments to decarbonize(去碳), but the question of   whether one is more effective for dealing with climate change     2     (not address) fully. With several countries on the brink of deciding whether    3     (back) new nuclear power plants to meet their carbon targets, the answer to this question matters

To find out, Benjamin Sovacool at the University of Sussex and his colleagues looked at carbon dioxide (CO2) emissions and GDP over 25 years. They found that in 117 countries that had been using renewables, CO2 emissions per capita(人均地)dropped from 0.69 tonnes(公吨)on average between 1990 and 2004 to 0.61 tonnes between 2000 and 2014 and     4     these latter figures included a further six countries.

During the same periods, however, the 30 countries that had been using nuclear power largely stayed flat, shifting from an average 0.52 tonnes of Co2 emissions per capita to 0.51. The two groups of countries overlap because some fall into both. Renewables included wind, solar, hydroelectric, and biomass energy. “If you’re focusing on    5     we can do to reduce emissions in the next 15 years,     6     (pursue) renewables instead of nuclear,” says Sovacool.

The reason    7     the results is not clear — the analysis found a connection, not a causation—but Sovacool has ideas. Nuclear power is restricted due to agreements     8     (limit) the spread of nuclear weapons     9     material from reactors (核反应堆) can be used to make bombs. Renewables are not, enabling more countries to learn from one another, such as Germany benefiting from Chinese economies of scale on solar. Other reasons for this    10     be that renewables are cheaper and quicker to build and more socially acceptable, says Sovacool.