Which is the main cause of obesity according to the passage？
A. Less physical exercises.
B. Oversleeping.
C. Irrational composition of our diet.
D. Ageing.
1921年年8月，美国总统()以“维护世界和平”为名，正式邀请英、日、法、意、中参加华盛顿会议。
A. 威尔逊
B. 哈定
C. 柯立芝
D. 罗斯福
According to the author, politicians in "the age of ascendancy" thought that television interviewers_____.
A. were their rivals in politics
B. should be honored to meet them
C. really aspired to be politicians too
D. gave them difficult time in interviews
What can NOT be inferred from the whole passage？
A. The obesity gene in humans was discovered five years ago.
B. Unbalance between nature and nurture is one of the causes of obesity.
C. Fat can directs our dietary preferences.
D. We shouldn't eat any sugar and fat any more in the future.
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