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【单选题】
Our ______ new machines are much more economical to run, compared to the old ones.A.
effective
B.
efficient
C.
affective
D.
affectionate
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【简答题】听力原文：Narrator Listen to part of a lecture in a marketing class. Professor Production and marketing of goods, services, and causes are the essence of economic life in any society. All organizations per...
【单选题】Science and technology have __________ in important ways to the improvement of agricutural production.
A.
attached
B.
assisted
C.
contributed
D.
witnessed
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