[单项选择]（）may seem helpful behavior to you can be understood as interference by others.
A. It
B. What
C. That
D. Which

Losing weight can seem like an unwinnable war. You know you need to eat less and exercise more, but that’s (1) impossible when everything in your life—from job stress to the temptation of fast and (2) foods—encourages you to do the (3) . A healthy diet and regular exercise are certainly the best weapons against weight gain, (4) the fact is that sometimes they aren’t enough. And that’s (5) science may someday be able to help.
In various research labs, researchers are closely looking (6) the biological mechanisms of obesity, (7) why some bodies store fat so (8) , and why others are better at burning the calories they (9) . They are discovering a surprising (10) of metabolic and physiologic factors that contribute to weight: did you know, for instance, that your intestines are full of bacteria that can (11) or restrain weight gain to some extent Or th
A. figuring out
B. pointing out
C. setting out
D. getting out