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Directions: Choose the option that is incorrect in spellings/grammar .
(1) The stars mainly consist of hydrogen and helium which produce nuclear reactions and energy.
(2) Experts say that carbon dioxide is ideal for doucing fires.
(3) The glue of urban infrastructure holds our cities' diverse population together .
(4) Only a show of kindness can persuade them.

A.1 & 3
C. 2
D.2 & 3
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