单项选择题

A．Mark the latest homework assignment.
B．Put a cancellation notice on the classroom door.
C．Make an appointment with the doctor.
D．Return some exams to his students.
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单项选择题
According to the passage, the use of Antarctic krill as a food is an innovation whose future is ______.
A．basically gloomy but still uncertain
B．somewhat promising but very tentative
C．generally bright and virtually assured
D．endangered by certain technical problems
单项选择题
A．Clever.B．Rich.C．Good.D．All the above.
A．Clever.
B．Rich.
C．Good.
D．All the above.
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