问题
单项选择题
一切从事科研、生产、经营的单位和个人（）执行国家标准中的强制性标准。
A.必须
B.一定
C.选择性
D.不必
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
一切从事科研、生产、经营的单位和个人（）执行国家标准中的强制性标准。
A.必须
B.一定
C.选择性
D.不必
参考答案：A
| 完形填空。 | |||
| Who taught you to walk when you were little? Who worries the most when you are 1 ? Who makes you dinner? It's your 2 . No matter what happens, she'll 3 the love for you. Do you know how did 4 Day come into being (产生)? It began in the US in 1907 when an 5 girl named Anna Jarvis started a campaign to honor (给......以荣誉) mothers. She believed that mothers could 6 people to get over the 7 of the War and to strengthen (加长) the relationship inside families. On Mother's day, children usually help their mothers do 8 . In western countries, bringing mothers 9 in bed is common. A mother will get up late while her children make her favorite breakfast. Children also make their own Mother's Day card 10 a thank-you note. Or they buy gifts and flowers for their mothers. | |||
|