練習(xí)材料：

[Day 1744 2019-07-06]

Lesson 18-1 Porpoises

There has long been a superstition among mariners that porpoises will save

drowning men by pushing them to the surface, or protect them from sharks by

surrounding them in defensive formation. Marine Studio biologists have pointed out

that, however intelligent they may be, it is probably a mistake to credit dolphins with

any motive of lifesaving. On the occasions when they have pushed to shore an

unconscious human being they have much more likely done it out of curiosity or for

sport, as in riding the bow waves of a ship. In 1928 some porpoises were photographed

working like beavers to push ashore a waterlogged mattress. If, as has been reported,

they have protected humans from sharks, it may have been because curiosity attracted

them and because the scent of a possible meal attracted the sharks.

任務(wù)配置：L0+L1+L4

知識(shí)筆記：

superstition? ? n. 迷信; 迷信觀念(或思想);

mariners? n. 水手;

porpoises? ? n. 鈍吻海豚; 鼠海豚;

waterlogged? ? adj. 水浸的; 水澇的; 水淹的; 進(jìn)水滿艙的; 浸滿水下沉的;

練習(xí)感悟：