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• 9. The extinction of dinosaurs 65 million years ago can be explained by__________ the impact theory.
• 10. ________ some animals can predict impending earthquakes still mystifiesbiologists.(A) How (B) No
• 11. ________nearly every part of the tiger has certain ‘mysterious’ curative effectsis a deeply root
• 12. ___________ its olfactory functions, the elephant’s trunk also serves asanother “limb” to bring
• 13. Many parts of Australia are not fit for life __________ lack of water.(A) because it (B) is beca
• 14. The elephant can bring food to its mouth and even carry heavy objects________ its trunk.(A) beca
• 15. __________other reptiles, the lizard lacks a constant body temperature.(A) Unlike (B) Likelessly
• 16. An analgesic is any drug that relieves pain ________ causing unconsciousness.(A) no (B) without
• 17. The ant, ________ the bee, is a social animal.(A) is like (B) likely (C) like
• 18. Some mammals are so tiny ________ only a few inches in length.(A) that measure (B) they measure
• 19. Gorillas, though heavily built and extremely ferocious, usually do not attackhumans unless _____
• 20. Owls live mainly on small rodents and can be found __________ other speciesof birds can survive.
• 21. _________ is active during the night, it likes to spend the day in hollow treesand to nest there
• 22. Biologists believe ___________ may help some reptiles to escape from theirenemies.(A) that losin
• 23. ________ the symptoms of AIDS do not appear at the time of its contraction.(A) Usually (B) Usual
• 24. ________ that forty percent of the oxygen of the world is produced in theAmazon rainforest.(A) I
• 25. ________ of oxygen and hydrogen, which are two of the trace elements in air.(A) Water being comp
• 26. ________ us the ability to resist disease, but also helps us build our bodytissues.(A) Not only
• 27. Amphibians are cold-blooded animals whose body temperature varies withtheir surroundings, and mo
• 28. Koala bears are ____________ marsupials.(A) leaves-eating (B) eating leaves (C) leaf-eating
• 29. Some __________ animals like giraffes, okapis, and cattle can extend theirtongues all the way to
• 30. _________ unwilling to do so, he had to follow the traditional ways of doingthings.(A) Because (
• 31. Taxonomy is a scientific method which deals with __________.(A) all living things are classified
• 32. The adult kangaroo may stand _______ tall as six feet in height.(A) as (B) that (C) so
• 33. Some species of baby fish are _______ tiny and transparent that they arealmost invisible.(A) too