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mloda1994
2012-12-08 09:35:51 UTC
#1
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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reduce their emissions of CO2 and other greenhouse gases, although so far, same
countries, such as the USA and Australia, p _____ any action.
a. A became B has become
b. A caused B have caused
c. A began B have begun
d. A occurred B have occurred
e. A returned B has returned
f. A burned B have burned
g. A contained B has contained
h. A was B has been
i. raised B has raised
j A caused B have caused
k. A always released B have always released
l. A contributed B has contributed
m. A signed B have signed
n. A came B has come
o. A agreed B have agreed
p. A did not take B have not taken
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