题干

下列有关生命系统的叙述正确的是(  )

A:生命系统中各生物体均具有多种组织、器官和系统

B:生物圈是地球上最基本的生命系统和最大的生态系统

C:H1N1流感病毒不属于生命系统,但其增殖离不开活细胞

D:肌肉细胞里的蛋白质和核酸属于生命系统的分子层次

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答案(点此获取答案解析)

C

同类题3

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

Dear son,

    The day that you see me old and I am already not in good health, have patience and try to understand me.

    If I get dirty when eating, if I can not dress, have patience and remember the hours I 1 teaching it to you. If, when I speak to you, I 2 the same things thousand and one times, do not 3 me, listen to me. When you were small, I had to read to you thousand and one times the same story 4 you got to sleep. When I do not want to have a 5, neither shame me nor scold me. Remember when I had to chase you with thousand excuses I 6, in order that you wanted to bathe. When you see my 7little about new technologies, give me the necessary time and do not look at me with your mocking (嘲弄) smile. I taught you 8 to do so many things: to eat good, to dress well, to confront life.

    When at some moment I lose the memory or the 9 of our conversation, let me have the necessary time to remember, and if I cannot do it, do not become nervous, as the most important thing is not our conversation but surely to be with you and to have you 10 to me.

    If ever I do not want to eat, do not force me. I know well 11 I need to and when not. When my 12 legs do not allow me to walk, give me your 13, the same way I did when you gave your first 14. And when someday I say to you that I do not want to 15 any more—that I want to rest forever, do not get angry. Someday you will understand.

    Try to understand that my age is not lived but survived. Some day you will discover that, 16 my mistakes, I always wanted the 17 thing for you and that I tried to prepare the way for you. You must not feel sad, or angry for seeing me 18 you. You must be next to me, try to understand me and to help me as I did it when you 19 living. Help me to walk, help me to end my way with love and 20. I will pay you by a smile and by the immense love I have had always for you.

    I love you, son.

Your father

同类题5

                                                                          Section A (10 marks)

          Directions: Read the following passage. Fill in the numbered blanks by using the information from the passage. Write NO MORE THAN THREE WORDS for each answer.

                          Not all print dictionaries are the same, as you will notice when you select one. To make a wise selection, you should know how to distinguish 

among three kinds of print dictionaries: pocket, desk, and unabridged. You should also know the copyright date of your dictionary, and

 check is special features.

          A pocket dictionary is small. Generally, it contains no more than 75000 entries, making it hardly to carry to class and efficient to use. 

However, a pocket dictionary doesn't contain enough entries to be adequate for college reference homework. In addition, the information 

about each word in a pocket dictionary is generally limited. A desk dictionary is medium sized, generally containing over 100,000 entries

 as well as extra features. For college work, you should own a current desk dictionary. An unabridged dictionary is a complete dictionary. 

Abridged dictionaries, such as pocket and desk dictionaries, are shortened. Because unabridged dictionaries contain nearly all English words,

 they are large and heavy. They are often used by schools and libraries.

           If the copyright date of your current dictionary shows that it was published five or more years ago, consider investing in a more recent 

edition. English is a dynamic language that admits new words and recognizes changes in meaning, spelling, and usage of familiar words.

 This is reflected in an up-to-date dictionary.

         In selecting a dictionary, check the features it offers besides vocabulary definitions. Many editions contain signs, symbols and foreign words.

 Some also contain CD-ROMs and access to special online features.

根据内容,在对应的空格写上正确的答案!

1、____2、 ____3、 ____4、 ____5、 ____ 

6、____7、 ____8、____9、 ____10、 ____