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=> Answer: B

At the beginning of paragraph B, the author emphasizes that “Geo-engineering has been shown to work, at least on a small localised scale”. This means geo- engineering has been somewhat effective so far. Then, he provides a successful project as an example. It is “For Decades, May Day parades in Moscow have

taken place under clear blue skies, aircraft having deposited dry ice, silver iodide and cement powder to disperse clouds”

• 
  be successful = work
  

1. a common definition of geo-engineering

=>Answer: A

In paragraph A, “Consequently, an increasing number of scientists are beginning to explore the alternative of geo-engineering – a term which generallyrefers to the international large-scale manipulation of the environment. “Refer to” is usually used to define a term, so we need to pay attention to the passage containing it.

• 
  common=generally
  
• 
  refer to (v)=define (definition)
  

1. to create a ……… that would reduce the amount of light reaching Earth.

At the end of paragraph B, “His scheme would employ up to 16 trillion minute spacecraft, each weighing about one gram, to form a transparent, sunlight- refracting sunshade in an orbit 1.5 million km above the Earth. This could, argues Angel, reduce the amount of light reaching the Earth by two per cent.

• 
  tiny=minute
  
• 
  create=form
  
• 
  far above Earth=1.5 million km above the Earth
  

=> Answer: sunshade

1. 
   place………in the sea
   
2. 
   to encourage to form
   

We need to find out a project which relates to “the sea”. In paragraph C, the author says “The majority of geo-engineering project so far carried out- which include planting forests in deserts and depositing iron in the ocean to stimulate the growth of algae – have focused on achieving a general cooling of the Earth.”

• 
  place=deposit
  

• 
  sea=ocean
  
• 
  encourage=stimulate