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【简答题】

(文)若f(x)= x-4 x-2 ,则f-1(2)=______.

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举一反三

【单选题】The H7N9 flu is reported ______ higher fever and coughing for several days.

A.
taking the form of
B.
to take the form of
C.
to be taken the form of
D.
having taken the form of

【单选题】下列说法不正确的是

A.
蛋白质水解的最终产物是氨基酸
B.
米饭在嘴中越咀嚼越甜的原因是淀粉水解生成甜味物质
C.
油脂、乙醇是人体必需的营养物质
D.
芒果中因含有酯类物质而具有香味