单项选择题

A．Because he was never afraid of anything.
B．Because he was protected by a special medium.
C．Because he had enough experience.
D．Because it was his job.
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问答题
According to the passage, a worker primarily works for_______________________.
单项选择题
It can be inferred from the passage that the author assesses the truth about opaque-2-maize in that ______.
A．it is a more recent innovation that the use of fish-protein concentrates
B．it can be stored as easily as other varieties of maize
C．it is more popular than the fish-protein concentrates
D．it may be more susceptible to insects than other varieties of maize
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