单项选择题

A．To accomplish them mainly through their own efforts.
B．To complete them with the aid of their tutors.
C．To read all the reference books assigned by the professors.
D．To get over all the periodicals, articles and books in the library.
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单项选择题
We learn from the first paragraph that ______.
A．too much publicity can harm the chances for the success of a new food innovation
B．innovations that produce culturally acceptable crops will generally be successful
C．a food-product innovation can be technically feasible and still not be economically feasible
D．it is difficult to decide whether a food-product innovation has actually been a success
单项选择题
The word spas (Para. 1) most probably refers to ________.
A．sports activity
B．places for physical exercise
C．recreation centers
D．athletic training programs
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