What is your zodiac（生肖） animal? According to the Chinese lunar calendar（农历）, 12 animals mark 12 different years. It is the basis of the Chinese zodiac. Nowadays, Chinese zodiac animals have worldwide fame and are increasingly popular among western people.
    The zodiac is an important part of Chinese culture. People believe that the characteristics of a zodiac animal influence the personality of every person born in that year. For example, people born in the Year of the Tiger are considered powerful and brave.
    Zodiac animals also have some social functions. When people think it is not proper to ask: “How old are you”, they may change their question to “What is your zodiac animal?” With this question, you can figure out roughly which year someone was born and the person’s age.
     Zodiac animals are not special to China. Many countries share a similar zodiac culture with China. For example, in the Japanese Zodiac, a wild boar（野猪）takes the place of a pig and the Vietnamese（越南的）zodiac has a cat instead of a rabbit.
    But have you ever wondered how these 12 animals were chosen to represent each year? According to legend, the Jade Emperor（玉皇大帝）invited all the animals to join him for Chinese New Year. Only 12 animals went to see him. As a reward he named a year after each one in the order they arrived. The ox would have been the first to arrive, but the rat sat on his back and jumped off just before they arrived to come in first place.

定义函数 $f\left(x\right)$ 如下表，数列 $\left\{a_n\right\}$ 满足 $a_{n+1}=f\left(a_n\right)$ ， $n\in {\text{N}}^{\text{*}}$ ，若 $a_1=2$ ，则 $a_1+a_2+a_3+\cdots +a_{2018}=$ （    ）

It takes us ____ (大约半小时) to get there.

下列依据实验目的所设计的实验操作中，正确的是(   )

选项	实验目的	实验操作
A	检验二氧化碳	将二氧化碳通入紫色石蕊溶液中
B	鉴别氮气和二氧化碳	将燃着木条伸入瓶中
C	硬水软化	加热煮沸
D	除去粗盐中的难溶性杂质	将粗盐研碎、溶解、蒸发

下列句子中画线词语使用有误的一句是