填空题

Listen to the statement and complete the following sentences with NO MORE THAN TWO WORDS. __________ have had a ban on the use of pesticides.

【参考答案】

Developed countries
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单项选择题
Dirty wool would __________ .
A．cause skin diseases in sheep.
B．provide a highly suitable food source for moths.
C．kill moths.
填空题
In under-developed countries, farmers have to use pesticides to get rid of __________ and communicable diseases.
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