题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式

New research suggests that our DNA 1. (help) us to decide whether we prefer coffee or tea. Researchers from a university in Australia studied how our genes affect our taste and why we like some tastes 2. (good) than others. Following the research, researchers believe they know why some of us prefer coffee while others like tea more. The researchers found that people who like more bitter tastes are more likely to drink coffee, The researchers said they found something strange in 3. (they) research, People who are more 4. (sense) to the bitter taste of caffeine are more likely to prefer coffee to tea.

Researchers looked at data on more than 400, 000 men and women in the United Kingdom. They also looked at an Australian study 5. compared the tastes of 1,757 twins with their siblings (兄弟姐妹). The researchers said genes weren’t the only factors (因素) 6. (affect) people’s tastes. Other things like our changing environment, social factors or 7. effects of taking medicine can also make us prefer coffee or tea, The researchers said we could learn to like coffee, Dr Liang-Dar Hwang said: “Bitter taste perception (直觉) 8. (shape) not only by genetics. but also environmental factors. Even though humans  9. (natural) dislike bitterness, we can learn to enjoy bitter-tasting food after being exposed 10. environmental factors.”