单项选择题

A. Because they have been in the sea for a long time.
B. Because metals become better after they have been in the sea.
C. Because it is easy to bring up metals.
D. Because some kinds of metals are worth a lot of money today.
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单项选择题
A. To see how certain chemicals produce different flavors.B. To determine if a person can distinguish salty and sweet solutions.C. To map the location of taste buds.D. To count the number of taste buds.
A. To see how certain chemicals produce different flavors.
B. To determine if a person can distinguish salty and sweet solutions.
C. To map the location of taste buds.
D. To count the number of taste buds.
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.
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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