题目

Scientists find that hard-working people live longer than average men and women. Career women are ____ than housewives, Evidence(证据)shows that ____ are in poorer health than the job-holders. A study shows __ the unemployment rate increases by 1%, the death rate increases correspondingly(相应地)by 2%. All this ___ one point: Work is helpful to health.Why is work good for health? It is because work keeps people busy, ____ loneliness and solitude(孤独). Researches show that people feel __ and lonely when they have nothing to do. Instead, the happiest are those who are ____. Many high ach24、如图，PA为⊙O的切线，A为切点，PO交⊙O于点B，PA=4，OA=3，则OP=5．