The passage is primarily concerned with ______.
A、informing readers of different sea creatures
B、describing predatory microscopic organisms
C、solving some long-lasting mysteries about the sea
D、discussing the environment for various fishes
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试题解析
文章主旨题。通读全文可知本文主要围绕Microscopic organisms展开,该篇文章谈到这种微生物的发现;它如何杀死鱼类;对人类有何影响以及进一步研究的必要性。因此选项B符合题意。