Said another way , we see in humankind a great imbalance between biological potential and environmental resistance．The result is the rapidly increasing world population，frequently referred to as the population explosion．Further ,to support our growing population，natural ecosystems are being increasingly displaced by human habitations，agriculture，and other human supporting activities．

　　17．From the passage we can infer that in the course of evolution

　　.

　　A．humankind is very important to earlier species，such as the primate group

　　B．human beings are limited by the environment while animals are not

　　C．human beings become more and more different from each other

　　D．humankind has experienced a generalization rather than specialization in ability

　　18．According to the passage，primate includes such animals as

　　A．monkeys and anteaters

　　B．tigers and apes

　　C．apes and monkeys

　　D．monkeys and giraffes

　　19．According to the passage，evolution has made it possible for humans to

　　A．increase the population

　　B．resist natural offers

　　C．go to the moon

　　D．cure all diseases

　　20．According to the author, imbalance between biological potential and environmental

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