题目

下列关于细胞的分化、衰老、凋亡的叙述，正确的是（  ） A．在细胞衰老和凋亡的过程中，细胞核的体积不断变小 B．细胞分化的过程中遗传物质不发生改变，但mRNA的种类和数量会改变 C．高度分化的细胞不具有分裂能力，故细胞核中的DNA不存在解旋的现象 D．细胞生长过程中体积增大，与外界环境进行物质交换的效率增强Answer the following questions by using the information taken from a dictionary page．（You may read the questions first．） jaguar: n．a type of large, yellow-colored cat with black markings found in the southwestern region of the U．S．and in Central and South America． jargon: 1．n．an unknown language that seems strange or impossible to understand．2．n．a language made up of two or more other languages: His jargon was a mixture of French and English- 3．n． the special vocabulary of a field or profession: Her report on computers was filled with jargon．4．n．speech that doesn't make sense． jaunt: 1．n．a trip taken for fun．2．v．to go on a brief pleasant trip: We jaunted to the country last Saturday．javelin: 1．n．a spear most commonly used as weapon or in hunting．2．n．the contest in which a javelin is thrown．3．n．a lightweight metal or wooden spear that is thrown in track-and-field contests．4, v．to strike, as with ajavelin． jazz: 1．n．a type of music that originated in New Orleans and is characterized by rhythmic eats．2．n．popular dance music influenced by jazz．．3．n．slang empty talk．4．ad．of or like jazz: a jazz band, jazz records． Jennet; n．a small Spanish horse． Which meaning of the word javelin is used in the sentence below? At the competition, Jack drew his arm back and threw the javelin 50 yards．        A．Definition 1          B．Definition 2    C．Definition 3        D．Definition 4 Which meaning of the word jargon is used in the sentence below? Doctors often speak in medical jargon．        A．Definition 1              B．Definition 2               C．Definition 3            D．Definition 4 What does the word jazz mean in the following sentence?        Don t give me that jazz, for lam a practical person．        A．nonsense             B．a kind of dance            C．a type of music           D．rhythmic beats