----, the 20th century has been characterized by developments in molecular biology.
A) Although biology is also very closely related to the disciplines of medicine and agriculture
B) Now that biology has received contributions from and made contributions to many other disciplines
C) Another 20th-century development has been the realization that
D) By utilizing modern methods of investigation, such as X-ray diffraction and electron microscopy
E) Just as the 19th century can be considered the age of cellular biology
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---- when we interfere with planetary processes on a large scale.
A) Climate change would almost certainly be accelerated
B) We were extremely lucky that industrialists
chose to use chlorine compounds not bromine
C) The polar regions were adversely affected too
D) We know surprisingly little about the risks we are running
E) Aerosol emissions stay in the atmosphere for only a few days
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As most of the neighbours gathered outside the house, ....... .
A) I was sure there was something wrong with poor Mr Green
B) people seem to be trying to help each other
C) we have looked for someone to help us for more than three hours
D) most of them were living in those terrible slums with their families
E) they have had to call the police in case we are in trouble
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