①表示二氧化碳这种物质

②表示1个二氧化碳分子

③ 二氧化碳由碳元素和氧元素组成

④1个二氧化碳分子由1个碳原子和1个氧分子构成

根据短文内容选择答案。

      There are four people in the twins’ family. They are the twins, their father and their mother.

      The twins’ names are Lucy and Lily. They are fourteen. They are in the same class in the NO.1 Middle School. They are very good students. They not only work very hard but also sing very well. They want to join the music club. Lucy wants to play the piano. Lily can play the guitar.

      Their father, Mr. King, is a teacher. He teaches English in a school near his home. Their mother, Mrs. King, is a teacher, too. She teaches Chinese. Mr. and Mrs. King are in different schools. But they have the same hobby — play the guitar.

用一组样本数据8，x，10，11，9来估计总体的标准差，若该组样本数据的平均数为10，则总体标准差s=____．

    Hollywood filmmakers, including creators of the 1998 Disney fílm Mulan, will start a “discovery trip” to Mulans birthplace —Huangpi district in Hubei province this week.

    During ____ two-day visit, they will see a number of Mulan-themed performances, such as horse fighting show and local opera. They also will visit ____ (place) of historical interest, like the Mulan Mountain and the Generals Temple.

    In the 20 years since the Disney film came out____(it) director Tony Bancroft hasn't been to the land of Mulan's roots. “For me, it's more than a circle tour of____ my favorite character was born. I'm also doing my homework for the next film,” he said.

    “China used to be closed off to Westerners, thus____ (create) a mystery, but in the last few years, U. S. films____(explore) the Chinese culture and environment, which has opened audiences to a whole new world. I believe the tale of Mulan appeals' to Westerners mainly____it's about a daughter's respect for her family____ (especial) her father.” Bancroft added.

    A live-action remake of the 1998 film____ (expect) to hit theaters in 2019. The Walt Disney Studios has announced that Chinese actress Liu Yifei, also ____(know) as Crystal Liu, is going to star in the classic Chinese tale

一个染色体上只有一个基因．（  ）（判断对错）