27.We can learn from the first paragraph that ______ ?

　　A.Dolphins have smaller brains than that of men.

　　B.Dolphins have had their intelligence not as long as men.

　　C.Dolphins have had their intelligence thirty times as long as men.

　　D.Dolphins are much more clever than men.

　　答案：C

　　[解析]這是一個(gè)細(xì)節(jié)理解題，考的是第一自然段中的一個(gè)細(xì)節(jié)。第一自然段的前部分講到“Dolphins’brains are 30 percent larger than those of people, and are equally complex.”(海豚的大腦比人類(lèi)的大30%，而且跟人類(lèi)大腦的復(fù)雜程度差不多)，故A)，D)均不正確。第一段最后一句話(huà)講到“fossil(化石)evidence reveals that they have had their larger brains for thirty million years, compared to around a million years for man.”(從海豚的化石證據(jù)顯示，他們擁有這么大型的頭腦已有3千萬(wàn)年的歷史了，而我們?nèi)祟?lèi)的頭腦只有一百萬(wàn)年的歷史。)C為正確答案。

　　28.It can be inferred from the passage that_____.

　　A.Dolphins' brains are much larger and more complicated than that of men.

　　B.Dolphins are able to display the ability of reasoning.

　　C.Dolphins can play music like human beings.

　　D.Dolphins often held their babies up to breathe fresh air.

　　答案：B

　　[解析]從inferred一詞得知此題是推理題。此題的推理依據(jù)是文章第一段，“During experiments dolphins have learnt to perform tasks that require logical reasoning”(在實(shí)驗(yàn)過(guò)程中，海豚們學(xué)會(huì)了做那些需要邏輯推理才能完成的工作)。由此我們可以判斷出，海豚是能夠有推理能力的，故選B。