1.In fact, the rays could pass as easily through the fleshy part of his hand as through the black paper, but hardly at all through the bone.

2.The answer would seem to lie in nuclear power stations.

3.If the world population goes on increasing at its present rate, we may, in fifty years' time, be burning up so much energy that we would damage the earth's atmosphere.

4.Psychologists deal with the minds and behavior of people.

5.Several people have been instrumental in the field of psychology.

答案：

1.事实上，就像穿过一张黑纸一样，射线很容易穿过手部的肌肉，但却根本不能穿过骨骼。

2.看来问题在于核电站。

3.如果世界人口继续以当前这种速度增长的话，也许，五十年后，这样燃烧如此多的能源将会致使我们破坏地球的大气层。

4.心理学家研究人们的心理与行为。

5.一些人在心理学领域起了很大作用。