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Believe it or not, oceans and seas are easy to be harmed by the development of human society. They are also influenced by man-made pollution easily. It is human beings that do great harm to [11] the ocean ecosystems.
The coral reefs（珊瑚礁）are fine ecosystems that provide food and protection for many ocean creatures（生物）. The coral in almost all of the oceans is in danger from pollution. Chemicals from factories end up in the seas and oceans and destroy（破坏）coral reefs. If the coral systems die，some ocean creatures will be sure to die out.
Protecting the ocean also has something to do with the protection of ocean wildlife like dolphins. The fishing industry depends on modern ways to catch many fish in order to earn more money. But the nets for fishing also catch other sea animals. The fishing boat workers are advised to check their nets and set other ocean animals free. But the boats are in a hurry [12] to make money and often other ocean animals are caught with fish.
( ) What does the second paragraph mainly tell readers?
A. The importance of protecting coral systems.
B. Coral reefs are home to ocean animals.
C. The great harm caused by factory pollution.
D. How ocean creatures depend on coral reefs.
本文是一篇自然与环保类的文章，主要讲述了人为活动已经严重破坏了海洋生态系统。如：许多海洋生物依附于珊瑚礁生存，但是现在大部分珊瑚礁已经被破坏了，人们过度捕捞给海洋生物带来了致命打击。最后呼吁大家要保护海洋生态环境。
本题题干意为：文章第二段主要想告诉读者什么？通读第二段可知，主要在强调珊瑚礁的重要性，但是珊瑚礁现在处境危险，所以呼吁大家要保护珊瑚礁。故答案为A。
自然环境与我们每个人的生活都息息相关，所以，保护环境，使人与自然和谐发展是每个人不可推卸的责任。我们在做这类题目时，可以从语篇的整体理解和细节推理等方面入手，带着问题从文中寻找相关的信息，这样答题就会既准确又快速。