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• 40. Scientists say feral pigeons are a valuable way of probing contaminants in environment, ___ they
• 41. Birds can seem to be everywhere during the day, flitting among trees, foraging on the ground,vis
• 42. The more significant your pet was to you, _____ the emotional pain you’ll feel.(A) intenser (B)
• 43. Conditioning is a way of learning by association, _____, by putting together different ideas.(A)
• 44. These results show ____ the mice in the treatment group healed more quickly than the controlmice
• 45. Pets have a relaxing ____. Petting or stroking an animal can improve your mood.(A) effect (B) af
• 46. The unseasonably cold weather has _____ affected the availability of some fresh produce in local
• 47. The Eisenhower Foundation will soon _____ its funding of external scientific research intosevera
• 48. The cat uses its ______ to balance and control the direction.(A) whiskers (B) blink (C) beard (D
• 49. The culture of animal cells in the laboratory was initially more of an art than a science, restr
• 50. _______the disease can be transmitted through air is still uncertain.(A) Whoever (B) Which (C) W
• 51. You must take ____ when walking around, as the village has many rabid dogs.(A) considerations (B
• 52. Not everyone has the time to go the gym and there is no need to. _________ at home is very easya
• 53. Proper blood ______ is a fundamental feature of good health.(A) circus (B) circumstance (C) circ
• 54. The oxygen from the air we _____ is carried through the blood from the lungs to all other partso
• 55. Today in the developed world, most blood donors are unpaid ______ who donate blood for acommunit
• 56. Plants are one of the two groups into which all living things were traditionally divided； _____
• 57. Plants usually ______ soil primarily for support and water.(A) rely on (B) grow into (C) come ab
• 58. The medicine is still in the experimental stage, but if it works, it _____ many people.(A) helps
• 59. ______ appetite over the course of 24 hours may not indicate a serious concern, but after the 24
• 60. Because of ambiguous or deceptive labeling of the dog food, the owner _____ will feed aninadequa
• The oceans are dying. But it’s not __(61)__ late to help. Plastic marine litter affects at least 267
• There’s a certain humanity in dogs. They always seem to have your best intentions in mind, theyalway
• Fire has been __(71)__ to civilizations for millennia, providing heat in the cold, light in the dark
• Several studies have focused on investigating health benefits of __(76)__ found in commerciallyavail