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【单选题】
分子筛催化剂要求再生剂含碳量在（）以下，才能充分发挥分子筛催化剂高活性和高选择性的优点。A.
0.2%
B.
0.3%
C.
0.4%
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【简答题】Listening 1 Popularity of different entertainment media Carol Day’s class done a survey in their year into the popularity of different kinds of entertainment media. Here, Ms Day is telling her class a...
【简答题】Listening 1 Popularity of different entertainment media Carol Day’ s class done a survey in their year into the popularity of different kinds of entertainment media. Here, Ms Day is telling her class ...
【单选题】Tom's score on the English test is the lowest in his class he ______ have studied very hard.
A.
may
B.
must
C.
should
D.
can
【简答题】完形填空。 Carol and Susan were great friends. They were in the same class at __ 1 __ , and they often played together after school. When Carol was eight years __ 2 __ , her mother had a baby. Carol was __...
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