第1题:
chemicals are not necessary for preserving food
a small quantity of bacteria in food is good to people
those chemicals that kill bacteria may not be good to people
there are other better ways to preserve food
第2题:
第3题:
第4题:
第5题:
第6题:
difficult
wonderful
funny
simple
第7题:
Buy Nothing Day in the U. S.
The Future of Buy Nothing Day
Free Dinners on Buy Nothing Day
Students’ Activities on Buy Nothing Day
第8题:
The woman has bought a few things for the man.
The woman has bought a lot of things for Mary.
The woman has bought nothing for Mary.
The woman has bought a few things for herself.
第9题:
第10题:
each
either
neither
every