The greatest (58)of whales is their diving ability．The sperm whale dives to the
Bottom for his (59)food，the octopus(章魚)．In that search he is known to go as far
Down as 3,200 feet, where the． (60)is 1,400 pounds，to a square inch．Doing so he
Will (61)underwater long as one hour．Two special skills are involved in this
storing up enough (62)(all whales are air—breathed)and tolerating the great change
in pressure．Just how he does it scientists have not (63)．It is believed that some of
the oxygen is stored in a special (64)of blood vessels，rather than just held in the
lungs．And it is believed that a special kind of oil in his head is some sort of compensating
mechanism that (65)adjusts the internal pressure of his body．But since you can’t
bring a live whale into the laboratory for study, no one knows just how these things work．
51 A aspects B signs C ways D reasons
52 A worked B divided C built D moved
53 A at B in C of D with
54A number B degree C distance D rate
55A abandon B attack C leave D board
56A as B who C which D t}1at
57A had B operated C Seen D caught
58A interest B job C danger D mystery
59A favorite B fast C new D sufficient
60A depth B pressure C level D size
61A set B become C remain D rest ．
62A heat B energy C food D oxygen
63A witnessed B determined C applied D calculated
64A system B place C arrangement D equipment
65A mentally B artificially C manually D automatically
Bottom for his (59)food，the octopus(章魚)．In that search he is known to go as far
Down as 3,200 feet, where the． (60)is 1,400 pounds，to a square inch．Doing so he
Will (61)underwater long as one hour．Two special skills are involved in this
storing up enough (62)(all whales are air—breathed)and tolerating the great change
in pressure．Just how he does it scientists have not (63)．It is believed that some of
the oxygen is stored in a special (64)of blood vessels，rather than just held in the
lungs．And it is believed that a special kind of oil in his head is some sort of compensating
mechanism that (65)adjusts the internal pressure of his body．But since you can’t
bring a live whale into the laboratory for study, no one knows just how these things work．
51 A aspects B signs C ways D reasons
52 A worked B divided C built D moved
53 A at B in C of D with
54A number B degree C distance D rate
55A abandon B attack C leave D board
56A as B who C which D t}1at
57A had B operated C Seen D caught
58A interest B job C danger D mystery
59A favorite B fast C new D sufficient
60A depth B pressure C level D size
61A set B become C remain D rest ．
62A heat B energy C food D oxygen
63A witnessed B determined C applied D calculated
64A system B place C arrangement D equipment
65A mentally B artificially C manually D automatically