某施工企业派出采购员张某去参加工业品展览会，并授权其采购一批外墙面砖．在展会期间，张某出示购买墙面砖的授权委托书及确定样品后，与甲建筑材料公司签订了一份外墙面砖供应合同。因洽谈顺利，张某发现该公司生产的卫生洁具质量上乘，且价格优惠，而现场正准备组织洁具供货，遂以公司名义又签订了50套卫生洁具供应合同。合同成立居，张某便随同甲建材公司送货车回到项目现场。

张某与甲建筑材料公司签订的外墙面砖供应合同属于( )合同。

A．无效

B．有效

C．效力待定

D．可撤销

In the past few years, quite a number of men and women have chosen to do something less    小题1:   (compete). They are afraid that the stress of work robs them of joy and happiness and    小题2:   (bring) them harm both physically and mentally.

In fact, however, stress isn’t such a bad thing    小题3:   it is often supposed to be. Above all,    小题4:  it gets out of control, a certain amount of stress is vital to provide motivation and challenge, and to give    小题5:  ,purpose and significance to    otherwise meaningless, idle life.       小题6:  , people under stress tend to express their full range of potential and to actualize their own    小题7:   (person) worth — the very aim of a human life. Last but not least, research from the universities of Kentucky and British Columbia has showed that moderate amounts of stress can actually    小题8:  (strong) the immune system and be good for health.

Stress is a natural part of everyday life and there is no way to escape. Developing our adaptive abilities to

deal with   小题9:   can prevent us from

  小题10:   (defeat) by the competitive society.