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1. About half the nation’s 2,000 beekeepers __________ north to find more flowers for their bees.
2. Electric rays stun their __________ with huge electrical discharges.
3. Dogs were probably the first animals to be __________.
4. The butterfly’s eggs soon __________ into larvae.
5. For most animal species, individuals are less likely to survive and __________.
6. Like most female athletes, she was lean and __________.
rare emigrate specify immigrate kind delineate propagation class matter problem breeding type
1. migrate
______________________________
2. define
______________________________
3. sort
______________________________
4. issue
______________________________
5. reproduction
______________________________
1. __________ is a complex issue, and 2. __________ define it differently, depending in part on what 3. __________ of animals they study.
1. 创新者的脑海中孕育出新思想。(hatch, innovative)
______________________________
2. 栖息地的丧失是包括大猩猩在内的许多濒危物种生存的主要威胁。(gorilla, habitat, endangered)
______________________________
3. 高科技领域的职位稀缺，但竞争却异常激烈。(scarce, fierce)
______________________________
4. 放牧动物对维护草原生态系统的健康至关重要。(graze, maintain, ecosystem)
______________________________
5. 健康保险可以帮助弥补因意外受伤或患病而产生的医疗花费。(compensate for, accidental)
______________________________