A、
Pot using.
B、
Wet cloth.
C、
Sand.
D、
Temperature.
【正确答案】
D
【答案解析】
A、
People who eat spoiled food may get sick.
B、
Farmers have to throw away spoiled products.
C、
Farmers have to sell the spoiled products quickly at a low price.
D、
People need money to dispose of the spoiled food.
【正确答案】
B
【答案解析】
A、
By electricity.
B、
Through an evaporation process.
C、
Through a freezing process.
D、
With the help of some special bacteria.
【正确答案】
B
【答案解析】
A、
He sold his invention to make money.
B、
He preferred invention to teaching.
C、
He was honored with an award for his teaching method.
D、
He financed 5,000 pot-in-pot systems to help people.
【正确答案】
D
【答案解析】
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