三、阅读下面的短文，根据短文内容，从短文后所给的选项中选出能填入空白处的最佳选项。
选项中有两项为多余选项。
Can dolphins talk? Maybe they can't talk with words, but they can talk with sounds. 1.
They are mammals(哺乳动物)，but they swim together in a group.
Dolphins talk to the other dolphins in a group. They give information. 2.
They say “welcome” when a dolphin comes back to the group. They talk when they play.
They make a few sounds above water. 3. People cannot hear these sounds because their pitch(音调) is very high. Scientists make tapes of the sounds and study them. Sometimes people catch a dolphin for a large aquarium. (An aquarium is a zoo for fish.) People can watch the dolphins in a show. Dolphins don't like to be away from their group in an aquarium. 4.
There are many stories about dolphins. They help people. 5. Many people are willing to protect dolphins. They say that dolphins can bring good luck to them.
A. They also show their feelings with sounds.
B. They may feel sad and lonely(孤独的).
C. They tell when they feel happy, sad or afraid.
D. Sometimes they save somebody's life.
E. They make many more sounds under water.
F. They are very cute to do many things.
G. Do you see a dolphin show?

1. A
2. C
3. E
4. B
5. D

我们可以根据上下文逻辑逐一匹配选项：
1. 空1前句点明海豚不用语言、而是用声音交流，A选项“它们也用声音表达自己的感受”承接上文，自然引出下文对海豚相关特性的介绍，符合语境。
2. 空2前句提到海豚会互相传递信息，C选项“它们会表达自己开心、难过或者害怕的情绪”是海豚传递信息的具体表现，和后文“欢迎归队的同伴、玩耍时交流”的内容呼应，符合语境。
3. 空3前句说明海豚在水面上只会发出少量声音，E选项“它们在水下会发出多得多的声音”形成对应，后文紧接着解释这类水下声音音调太高人类无法听见，逻辑连贯。
4. 空4前句提到海豚不喜欢在水族馆里脱离自己的族群，B选项“它们可能会感到难过和孤独”是脱离族群后的状态，符合语境。
5. 空5前句提到海豚会帮助人类，D选项“有时候它们会救人类的性命”是海豚帮助人类的具体事例，和后文人们愿意保护海豚的内容衔接自然。