Misled people tend to think that using an animal

The writer thinks that a new job is______to people． A．a duty B．a challengeC．an

Although many people tend to live under the illusion that traditional technology and

People in eating disorders tend to ______.A．strive to be thin by starvationB．take an unhea

CAN ANIMALS BE MADE TO WORK FOR US？ Can animals be made to work for us？ Some scientists think that one day animals may be trained to do a number of simple jobs that are now done by human beings. The

Helping strangers used to be considered as a virtue. But nowadays people tend to be very c

Populations tend to grow at an exponential （指数的) rate. This means that they progressive