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【简答题】
已知函数 f(x)= 9 x 9 x +3 ，则f（0）+f（1）=______，若 S k-1 =f( 1 k )+f( 2 k ) +f( 3 k )+…+f( k-1 k )(k≥2，k∈Z) ，则S k-1 =______（用含有k的代数式表示）．
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【简答题】What is the “luxury treatment”?
【单选题】What is the main idea of the last paragraph?
A.
To live with computer is luxury.
B.
To care about your appearance has become an avoidance
C.
We should not be controlled by computers and the Internet.
D.
Having computers, people do not need human contact anymore.
【单选题】What is the real luxury according to the author?
A.
To buy local unpackaged food everyday.
B.
To get juice from the juicer everyday.
C.
To talk about sustainability with her friends.
D.
To live a life that is more real and healthy.
【简答题】What is the “luxury” in this paragraph?
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