雅安市第三届人民代表大会第一次会议秘书处议案组收到人大代表的提案数量比去年有所增加。这些提案不但议题广泛，而且形式规范。这表明 [ ]

①我市人大代表的履职意识不断加强

②我市人大行使决定权

③人大代表是国家权力的直接行使者

④人大代表在履行决定权

A、①②③

B、②③

C、①③

D、①④

During recent years we have heard much about "race": how this race does certain things and that race believes certain things and so on. Yet, the (51) phenomenon of race consists of few surface indications.

We judge race usually from the coloring of the skin: a white race, a brown race, a yellow race and a black race. But (52) you were to remove the skin you could not tell anything about the race to which the individual belonged. There is nothing in physical structure, the brain or the internal organs to (53) a difference.

There are four types of blood. All types are found in every race, and no type is distinct to any race. Human brains are the (54) . No scientists could examine a brain and tell you the race to which the individual belonged. Brains will (55) in size, but this occurs within every race. (56) does size have anything to do with intelligence. The largest brain ever examined belonged to a person of weak (57) . On the other hand, some of our most distinguished people have had (58) brains.

Mental tests which are reasonably (59) show no differences in intelligence between races. High and low test results both can be recorded by different members of any race. (60) equal educational advantages, there will be no difference in average standings, either on account of race or geographical location.

60().

A.Provided 

B.Concerning 

C.Given 

D.Following