40. The problem of using landfills ______
a. is the acids and poisonous chemicals being leaked from the landfills
b. is biodegradable waste
c. can be solved
d. has no effect on people
B. Fill in each numbered blank with one suitable word or phrase.
Why do we need to (41) ______ food? There are at least three reasons.
Firstly, it is necessary for us (42) ______ food fresh for our daily needs. Many kinds of food, (43)
______ fruit and vegetables, are only available at certain times (44) ______ the year. (45) ______,
if we want to eat these foods all year round, we need to preserve them. Secondly, we (46) ______
need to preserve food for exporting overseas to (47) ______ sure that it is always in good (48)
______ in transit. Lastly, we need to preserve food for the time (49) ______ food shortages
happen. There are a number of methods of preserving food: both high and low
temperatures, (50) ______, irradiation, and drying.
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