第2题
A.3 billion dollars.
B.4 billion dollars.
C.5 billion dollars.
D.6 billion dollars.
第3题
A.They can destroy the houses of farmers.
B.They can injure animals and farmers.
C.They destroy crops.
D.They get into animal feed.
第4题
A.To spread a kind of virus within the ants themselves.
B.To use fire to destroy them.
C.To create a kind of powerful poison to destroy them.
D.To raise other biological animals to kill them.
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