Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks.  The great white shark is larger, faster, and more dangerous than most. It can (51)______ a length of 20 feet and weigh 70,000 pounds. Though its preferred diet is seals and dolphins, (52)____ this fearsome fish regularly attacks almost any type of warm-blooded animal. In its snout are small holes that lead to receptors. These receptors (53)_____ electrical nerve signals in the prey. The shark also has other sensors that detect blood in the water. Very rare in tropical or polar regions, great whites patrol mainl. temperate ocean coastlines. The body is designed for efficiency in the water It is broad in the middle and tapered (54)______ the ends for streamlined movement. Winglike pectoral fins provide lift and stability. Oil stored in the liver adds goyancy. The tail fins are vertical and (55)________ as a rudda Amazingly it never (56)______ swimming. All sharks are fish and most are carnivores. The great while is Esc world's largest predatory shark. The whale shark is nearly twice as big, but like a baleen whale, eats mainly plankton. The blue whale is the largzst known mammal to ever (57)________. Its size ranges from 70 to 100 feet in length and up to 125 tons in weight (250,000 pounds). (58)________its enormity, the blue whale lives on hill, a tiny crustacean, and other plank tonic organisms. An adult ingests 3-4 tons of krill per day. This is done by scooping up large quantities of water containing hill with its huge mouth. In its mouth are not teeth, but rather a series of sheets, similar in consistency to our fingernails, (59)_______that serve as a filtering system. These sheets, or baleen, grow from the roof of the mouth, ranging from smooth to brushlike. Blue whales have been hunted relentlessly in the past for their blubber and oil. As a result they were nearly hunted to (60)____and still remain on the endangered animal list. Trả lời câu hỏi dưới đây: _________(51)