How many independent clauses does a simple sentence contain?
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A complex sentence contains 3 independent clauses, true or false?
A. true
B. false
What city in England did we learn about today?
A. Manchester
B. Liverpool
C. London
What special celebration in Rio, Brazil we learned about today?
A. Carnival
B. Saint Patrick’s Day
C. Independence Day
Cu-Zn原电池的电池反应为Zn+Cu2+=Zn2++Cu,写出电池符号: