单项选择题
A.人们认为，复杂的动物是由比较简单的动物发展而来的。 B.人们普遍认为，较高级的动物是由比较低级的动物进化而来的。 C.人们一般认为，动物都是从简单到复杂转变而来的。 D.它被相信，动物的变化都是从麻烦到简单。
A．an increase of unemployment B．a decrease in tourist attractions C．the higher cost of support facilities D．a rise in price and a fall in pay
A．We can find some ways to avoid stress. B．Stress is always harmful to people. C．It is easy to change the habit of keeping oneself busy with work. D．Different people can withstand different amount of stress.