单项选择题

A．The mother and the son.
B．The customer and the waiter.
C．The teacher and the student.
D．The doctor and the patient.
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单项选择题
What is the most alarming consequence of the fast growing population
A．Species are dying out at an unnatural high speed.
B．Living areas for wildlife are disappearing rapidly.
C．The global weather is becoming warmer.
D．All kinds of natural resources are draining.
单项选择题
By saying that humans have never had it so good (Linel, Para. 2), the author means that people nowadays ______.
A．enjoy a much better life than before
B．has reached the peak of civilization
C．are more powerful in changing the earth
D．live in a world with more advanced medical science
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