Successful scientists have often been people with wide interests. Their originality may 【A1】 _____ their diverse knowledge. Originality often consists in linking up ideas whose connection was not 【A2】 _____ suspected. Furthermore, variety stimulated freshness of outlook 【A3】 _____ too constant study of a narrow field tends to 【A4】 _____. Therefore reading ought not to be confined to the problem 【A5】 _____ investigation nor even to one’ s own field of science, 【A6】 _____, indeed, to science 【A7】 _____. However, outside one’ s 【A8】 _____ interests, in order to minimize time spent in reading, one can read for the most part 【A9】 _____, relying on summaries and reviews to 【A10】 _____ major developments. Unless the research worker 【A11】 _____ wide interests his knowledge may get narrower and restricted to his own 【A12】 _____. One of the advantages of teaching is that it 【A13】 _____ the scientist to keep abreast of developments in a wider field than he 【A14】 _____ would.

It is more important to have a clear understanding of general principles, without, however, thinking of them as fixed laws, than to 【A15】 _____ the mind with a mass of 【A16】 _____ technical information which can readily be found in reference books or card indexes. For 【A17】 _____ thinking it is more important to see the 【A18】 _____ than the trees; the student is in danger of being able to see only the tree. The scientist with a mature mind, who has 【A19】 _____ a good deal on scientific matters, has not only had to accumulate technical details but has acquired enough 【A20】 _____ to see the wood.