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【单选题】
What you eat or drink helps you stay healthy. Drink lots of water Our bodies need more water, especially after sports or in hot weather, we should drink about six to eight glasses of water every day. Eat lots of fruit and vegetables Try to eat at least five types of fruit and vegetables every day. It's easier than you think. Cut down on sugar We should try to have fewer foods and drinks rich in sugar. Having these foods and drinks too often can cause tooth and other problems. 2.People should eat at least _________ types of fruit and vegetables every day.A.
four
B.
five
C.
six
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【简答题】已知函数f（x）= sin2x-2sin 2 x， （Ⅰ）若点P（1， ）在角α的终边上，求f（α）的值； （Ⅱ）若 ，求f（x）的值域。
【简答题】求函数f（x）= sin 2 x+cos 2 x+ sin2x， （1）求f（x）的周期与值域； （2）求f（x）在[0，π]上的单调递减区间。
【单选题】Thinner isn t always better. A number of studies have【C1】______that normal-weight people are in fact at higher risk of some diseases compared to those who are overweight. And there are health conditio...
A.
denied
B.
concluded
C.
doubted
D.
ensured
【简答题】眉梢的位置是____
【简答题】Thinner isn’t always better. A number of studies have __1___ that normal-weight people are in fact at higher risk of some diseases compared to those who are overweight. And there are health conditions...
【单选题】小明做分析实验时,称了 0.0204g 的苯甲酸样品,准备用紫外可见分光光度计测定其含量。按照分析方法的原理来分,本次分析属于
A.
常量分析
B.
半微量分析
C.
化学分析
D.
仪器分析
【单选题】小明做分析实验时,称了 0.0204g 的苯甲酸样品,准备用紫外可见分光光度计测定其含量。按照试样的用量来分,本次分析属于
A.
常量分析
B.
半微量分析
C.
化学分析
D.
仪器分析
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