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【单选题】
下列计算用的加法运算律是 - +3 . 2- +7 . 8 =- +(- )+3 . 2+7 . 8 =-( + )+3 . 2+7 . 8 =-1+11=10 [ ]A.
交换律
B.
结合律
C.
先用交换律,再用结合律
D.
先用结合律,再用交换律
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反馈参考答案：
举一反三
【判断题】One of the advantages of drama is that the dramatists can directly speak to their readers, or the audience, and they can receive instant feedback of audiences.()
A.
正确
B.
错误
【单选题】There are citizens who support graffiti, saying it’s a welcome addition to _________ dull street.
A.
otherwise
B.
rather
C.
therefore
D.
approximately
【简答题】若要完成数据透视表操作，只需单击 |“表格”菜单的“数据透视表”选项，选择数据透视表，出现“创建数据透视表”对话框，在其中进行相关设置即可。
【单选题】By saying '$o are the attendant health risks'(Line 1, Para. 3), the author means______.
A.
America suffers health risks as well as the overweight problem
B.
health risks resulted from overweight are serious too
C.
overweight is classified as one of the health problems
D.
people have also pay much attention to the possible health risks
【单选题】婴儿一般每日能量需求总量为（）（）
A.
397.4kJ/kg（95kcal/kg）
B.
460kJ/kg（110kcal/kg）
C.
502kJ/kg（120kcal/kg）
D.
250kJ/kg（60kcal/kg）
E.
42kJ/kg（10kcal/kg）
【单选题】婴儿一般每日能量需求总量为
A.
397.4kJ/kg(95kcal/kg)
B.
250kJ/kg(60kcal/kg)
C.
502kJ/kg(120kcal/kg)
D.
42kJ/kg(10kcal/kg)
E.
460kJ/kg(110kcal/kg)
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