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【单选题】
What is the action of melatonin?A.
Causes the growth of the body
B.
Causes the production of milk
C.
Increases the metabolic rate of cells and produces body heat
D.
Regulates a person's sleep / awake cycle
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【简答题】已知函数f（x）=x 2 +（a+1）x+lg|a+2|（a∈R，且a≠-2）． （I）若f（x）能表示成一个奇函数g（x）和一个偶函数h（x）的和，求g（x）和h（x）的解析式； （Ⅱ）命题P：函数f（x）在区间[（a+1） 2 ，+∞）上是增函数；命题Q：函数g（x）是减函数．如果命题P、Q有且仅有一个是真命题，求a的取值范围．
【简答题】Some people think that when s are talking, it is not polite of children tojump _____.
【简答题】bystander; coach; collision; furious; license; mechanic; option; punishment; verdict; wage 1. My father was _______ because someone drove into his car while it was packed. 2. The job’s ...
【简答题】Fill in the blanks with the words given below. Change the forms where necessary. bystander coach collision furious license mechanic option punishment v...
【单选题】如果f（x）是奇函数，g（x）是偶函数，且f（x）+g（x）=-x 2 +2x-3，那么函数f（x）-g（x）=（ ）
A.
x 2 +2x+3
B.
x 2 -2x+3
C.
-x 2 +2x-3
D.
-x 2 -2x-3
【简答题】如果函数f(x)与g(x)的定义域相同,且f(x)是奇函数,g(x)是偶函数,请说明函数F(x)=f(x)g(x)是奇函数。
【简答题】完形填空。 Everybody dreams. Some people think dreams can tell us about the future. Other people think dreams tell us about ourselves. It's like our 1 is talking to us. Why are dreams 2 strange and hard to...
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