问题 选择题

桃子的果实内有一枚种子,西瓜的果实里有许多枚种子,(  )

A.雄蕊和雌蕊

B.花粉

C.胚珠

D.精子

答案

答案:C

题目分析:传粉、受精完成后,花的花冠、花萼(部分存留)、雄蕊以及雌蕊的柱头、花柱都凋落,只有子房继续发育,其中子房壁发育成果皮,整个子房发育成果实,而胚珠内的受精卵发育成胚,整个胚珠则发育成种子,可见种子是由胚珠发育来的,所以果实内种子的多少与胚珠的数目有关,故选C

改错题

短文改错。

     假定英语课上老师要求同桌之间交换修改作文,请你修改你同桌写的以下作文。文中共

有10处语言错误,每句中最多有两处,每处错误仅涉及一个单词的增加、删除或修改。

      增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

      删除:把多余的词用斜线(\)划掉。

      修改:在错的词下划一横线,并在该词下面写出修改后的词。

      注意:1.每处错误及其修改均限一词。

                2.只允许修改10处,多者(从第11处起)不计分。

                3、只允许修改十处, 多者(从第11处起) 不计分。

     I'm a middle school student name Li Ming. I'm writing to tell you something. Recently I have noticed

many of my classmates often go to the cyber café near our school. I go there too the other day. I was

surprising to see many students playing computer games, watching films or chat. Some students were

even talking about love affairs online. On my opinion, the cyber café should be a place that we can find

much useful informations. The Internet should be a window to the outside world rather than place for

games. The Internet is good if we make a good use of it. Otherwise, it will give us great harm. So the

local government should take measures to make sure that students use cyber cafes positively.

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单项选择题 案例分析题