D.The limitation of oxygen supply.
解析:选A。推理判断题。根据倒数第二段中的最后一句可知本题选A。
2.How can we slow down the ripening of bananas exposed to the air?
A.To rest them on the counter.
B.To keep them in the basket.
C.To put them on the ground.
D.To hang them up from the ceiling.
解析:选D。细节理解题。根据Now set up the bananas in their environments as follows中的最后一点可知本题选D。
3.It can be concluded from the passage that ________.
A.the ripening banana is a self-contained system
B.the rate of ripening bananas is affected by the environment
C.wrapped bananas experience no chemical changes to ripen
D.ripening bananas give off oxygen,CO2 and ethylene
解析:选B。推理判断题。由第二、三两段的意思可知本题选B。
4.Why are bananas sealed in plastic in many supermarkets?
A.To make them ripen more quickly.
B.To make them ripen more slowly.
C.To make bananas flesh soften.
D.To turn green bananas yellow.
解析:选B。细节理解题。根据最后一段的倒数第二句可知本题选B。
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