[单选题]呼吸性粉尘的空气动力学直径是
A.5μm以下
B.5～10μm
C.10～15μm
D.15～20μm以上
E.20μm以上

Even today in the modem, developed world, surveys show that parents still prefer to have a boy rather than a girl. One longstanding reason why boys have been (26) as a greater blessing has been that they are (27) to become better economic providers (28) their parents’old age. Yet it is time for parents to (29) again. Girls may now be a better investment.
Girls get better (30) at school than boys, and in most developed countries more women than men go to (31) . Women will thus be better (32) for the new jobs of the 21st century, in which brains (33) a lot more than physical strength. In Britain far more women than men are now (34) to become doctors. And women are more (35) to provide sound advice on investing their parents’nest egg. Surveys show that women consistently (36) higher financial returns than men do.
(37) , the increase in female employment in the rich world has been
A. treated 
B. equipped 
C. arranged 
D. provided

1、新上任的李协理员，一大早就到下岗失业人员王某家，进行入户走访。敲了半天门，门才开。王某很不高兴，还没等协理员完全说明来意，就以别的借口结束了这次谈话。李协理员带着满腔热情而来，没想到是这样的结果，感觉很不理解。
2、李协理员因为这件事生了一天闷气，情绪很低落。可是晚上还有一户蒙古族下岗失业人员需要走访，于是打起精神又投入了工作。入了户，被访人告诉李协理员：他下岗后，家里生活很困难，是否可以去办理失业保险，李协理员答应帮助被访人协助办理这件事。被访人很高兴，于是煮了他们民族特有的奶茶款待李协理员，李协理员坚决推辞。被访人突然改变了热情的态度。李协理员今天第二次遭遇这种情况，情绪有些激动了，和被访人吵了起来。