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37
6. Use the prompts to make a present perfect simple question about scientific
advances. Then answer yes or no.
a. scientists / discover a cure for the common cold?
Have scientists discovered cure for the common cold?
b. people / live for long periods in space?
c. human beings / land on Mars yet?
d. scientists / invent time travel yet?
e. doctors / manage to transplant human hearts?
f. archaeologists / find the lost city of Atlantis?
g. scientists / ever teach an animal to talk?
7. Read the text about climate change. Choose the correct form, A or B, to
complete the sentence.
At the moment, scientists agree that the world's climate a B
warmer over the past 50
years, but they disagree about the causes. Same believe that human activities b _____
climate change. They argue that for 1,000 or 2,000 years before 1850, when records c
_______ , the temperature was more or less stable. Short warm or cold periods
d_____ during that time, but the climate always e ______ to the same level.
However, since the Industrial Revolution, human beings f ______ more and more
fossil fuels, such as coal and oil. In 1800 the atmosphere g ______ around 280 parts
per million of carbon dioxide (CO2). Since then there h ______ an increase of about
31%. This extra carbon dioxide I ______ the world's temperature because of the
greenhouse effect.
Other scientists disagree that human activities over the past 50 years j ______ global
warming. They point out that volcanoes and other natural processes k _____ CO2
into the atmosphere, and that human activity I _____ a rise in CO2 of only three per
cent.
In 1999, 156 countries m ______ the Kyoto protocol, part of a United Nations
agreement on climate change, which n ______ into force in 2005.They o ______ to
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