在核算一定时期的各项经济收支往来时，人们通常使用的结算方式是（    ）。

①债券结算       ②银行转账         ③外汇结算        ④现金结算

将一盏灯L接到某电源上，它的功率为40瓦；如果将该灯和电阻R串联后接到原电路中，则电阻只消耗的电功率为3.6瓦，设电源电压不变，灯的电阻不随温度而改变，且灯的电阻大于R，此时灯的电功率是（　　）

下列选项中，属于动植物细胞共有的糖类是

完形填空
    My mother is a doctor.She is unable to get back home 1 every day.And she has to work on weekends sometimes.So it's hard for her to do all the 2 after work.
    As a member of the family，I think it's my duty to 3 some housework.4Mom always says she doesn't need any help，there are always things I can do.5 ， I can help do the dishes and set the table.I'm sure Mom loves me 6 to help her.
    What's more，I'm trying to be 7.I wash my own clothes，tidy up my bedroom and take care 8 my things.I'm old enough to do these things.And I can't9 on my parents forever.
    Always show your 10 to your mom for everything she does.I believe she will feel sweet.Try it now.

生物实验中常用到对照，以下对照设置正确的是