单选题 For the past several years, I have been immersed in the study of friendship, and among the many things I have learned, one idea stands out: If you truly want to change some aspect of your life, developing friendships with people who aspire to the same goals as you do can lead to more successful endeavors than embarking on solitary efforts. Shortly after we make a decision to change our behavior, we often sense a softening of what at first felt like ironclad conviction. We chastise ourselves for our inability to summon motivation and return to the poor habits we're trying to break to comfort us, actively undermining our goals. What a disheartening cycle. But research shows that having friends with the same goal can interrupt that cycle. Researchers James Fowler and Nicholas Christakis have demonstrated that weight loss (and gain) spreads through friend groups, most likely via a process of altered norms. It's not that you'll necessarily adopt your friend's new habits right away, but the seed will be planted. If you want to continue to feel close to her, you might even start adjusting your own routines (perhaps unconsciously) to align them more with hers. Friends can help you reinforce individual willpower. In The Power of Habit, Charles Duhigg recommends replacing the cues that trigger, and the rewards that follow, bad behaviors with new, healthier ones. The cue and reward of a real person knocking on your door for a joint jog, and a stimulating talk over coffee afterwards, is a particularly alluring replacement for whatever previously sucked you into sedentary TV watching. In a recent New York Times column, "How People Change," David Brooks noted that, "There's a research suggesting that it's best to tackle negative behaviors indirectly, by redirecting attention toward different, positive ones." Investing in fulfilling friendships with those who have the values and habits you admire will lift you up to those friends' level more easily. The desire to be with, be like, and be liked by friends is primal. We're all built to seek out strong bonds with friends on whom our very survival might have once been dependent. While we don't necessarily need friends to help hunt or fight off predators these days, most of us probably still feel like we can't live without them. Tap into that deep-down social motivation and you'll not only be primed for success, you'll take pleasure in the proverbial journey.

单选题 According to Paragraph 2, a determination to change a behavior is often closely followed by .

单选题 Researchers have indicated that change of weight spreads among friends probably through _____.

单选题 The example of joint jog is mentioned in Paragraph 4 to demonstrate that_____.

单选题 David Brooks would most probably agree that _____.

单选题 The most appropriate title of this text would be _____.