Honeybee populations in the United States 61 （ decrease） dramatically over the decades. And a new study suggests that a certain kind of pesticide could be making things 62 （ bad）.
The number of honeybees hasn't changed much over the past few years, but the overall picture doesn't look good for an insect that plays 63 important role in our food supply. Scientists don't know for sure 64 this is happening. Pesticides and parasites （寄生虫）are the most suspected reasons, and a study recently published in the scientific journal. One suggests that neonicotinolds （烟碱类农药）,types of pesticides that 65 （ use） around the world, are incredibly poisonous to honeybees and other insects. Part of the reason for that is because these pesticides appear 66 （stick） around in the environment and stay dangerous for longer periods of time.
Though they're deadly to insects, neonicotinolds are not considered dangerous to humans. An ongoing challenge 67 farmers is finding ways to keep other insects away while still 68 (protect)bees. Pesticides may not discriminate between the insects they kill, though neonicotinolds maker says the chemical's risk to bees is lower when it's used properly. The U. S. Department of Agriculture says it's 69 （ likely ） that there's one magic 70 (solve) to the problem, but there are a number of organizations trying to help honeybees.
答案 61. have decreased/have been decreasing 62.worse 63.an 64. why
65. are used 66. to stick 67. for 68.protecting 69.unlikely 70.solution