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写结构式：2、2-丁烯-1-醇

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写结构式：3、乙醚

微生物准性杂交育种的基本步骤是什么

Trainers reward the monkeys by using positive reinforcement, such as food, drink, praise, and ____(感情) .

For example, compared with humans, dogs are “far superior at tracking down odors,” says Marian Bailey, an animal ____(行为科学家) at Henderson State University in Arkansas.