Passage 2 Question 19to 21are based on the passage you have just heard. A: Because there was no salary increase. B: Because there was no flexibility. C: Because the boss was not understanding. D: Because she had no passion anymore.

Questions 19to 21 are based on the passage you have just heard. A: It often rains cats and dogs. B: Itseldom rains in summertime. C: It does not rain as much as people think. D: It is one of the most rainy cities in the US.

【填空题】19//4= ,19%4= , -19//4= , -19%4=

某班学生年龄(单位:岁（）分布如下:18 17 19 18 19 20 18 19 19 18 19 18 19 18 17 21 18 1919 18 17 18 19 18 19 20 18 20 19 19 19 18 19 18 17 21 18 19 20 18 18 17 20 17 19 20 19 18 19 18要求:(1（）以学生年龄为分组标志编制分布数列（2）分别按向上和向下两种形式进行频数累计并列表说明。

AmongCovid-19 , 19 refers to _______. A: the year 2019 B: 19 kinds of viruses C: 19 persons D: 19 diseases

19%4的值:_______;-19%-4的值：_________;-19%4的值：_________;19%-4的值：________

在三线摆实验中，连续测三次周期，下列哪组数据不正确：。 A: 1'18"98 1'19"21 1'19"37 B: 1'19"34 1'19"79 1'20"10 C: 1'19"11 1'19"33 1'19"75 D: 1'18"56 1'19"27 1'19"65

人体的髋骨愈合为一个整体要在（）。 A: 19~20岁 B: 19~21岁 C: 19~23岁 D: 19~25岁

青书学堂: (19). (单选题) （19）

下面（）是日期型常量. A: "12/19/99" B: 12/19/99 C: #12/19/99# D: {12/19/99}