问题
选择题
切西瓜或削水果时,会有许多汁液流出,这些汁液通常是( )
A.细胞液
B.细胞质
C.液泡
D.叶绿体
答案
A、液泡里含有细胞液,含有各种有味道的物质,以及营养物质等,如西瓜的汁液中含有大量的营养物质,有甜味,就是来自于液泡的细胞液,A正确;
B、细胞质具有流动性,能加速细胞内外物质的交换,B错误;
C、液泡里含有细胞液,C错误,
D、叶绿体是光合作用的场所,D错误.
故选:A.
切西瓜或削水果时,会有许多汁液流出,这些汁液通常是( )
A.细胞液
B.细胞质
C.液泡
D.叶绿体
A、液泡里含有细胞液,含有各种有味道的物质,以及营养物质等,如西瓜的汁液中含有大量的营养物质,有甜味,就是来自于液泡的细胞液,A正确;
B、细胞质具有流动性,能加速细胞内外物质的交换,B错误;
C、液泡里含有细胞液,C错误,
D、叶绿体是光合作用的场所,D错误.
故选:A.
阅读理解。 |
Van is Jim's new friend at school. Van comes from a country far away. He doesn't talk like the other children in school. But he can do numbers and draw. The teacher asks Jim to show Van around and help him. Van sits with Jim and his friends at lunch. Jim shows Van how to play kickball. Jim points to something and says the word. Van tries to say the word. Van is learning many new words. He wants to learn how to read. Van is happy that Jim helps him and is his friend. Jim likes Van, too, because Van tries so hard. |
1. In the picture, Van is ______. |
[ ] |
A. reading a book B. crying C. having lunch D. angry |
2. When Van first comes to school he can't ______. |
[ ] |
A. talk like the other children B. do numbers and draw C. eat the food D. find a friend to help him |
3. The teacher asks ______ to show Van around. |
[ ] |
A. his deskmate B. his sister C. Jim D. his friends |
4. The story says Jim likes Van because Van ______. |
[ ] |
A. can read B. tries very hard C. is nice D. can draw |
5. The best title (题目) is ______. |
[ ] |
A. At School B. Van Plays Ball C. Van Smiles D. Helping a New Friend |