正确答案: A

正确

题目：某些被子植物的成熟花粉中，营养核与生殖细胞或营养核与2个精子存在着密切的关系，叫雄性生殖单位。( )

解析：A

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举一反三的答案和解析：

[单选题]参展上海世博会的我国各省市馆基本反映了当地的自然与人文特色。有展示鼓楼、苗寨、银饰等民族元素的：有展示蒙古包、祥云、马鞍等文化元素的：有以冰雪为主线布局展馆的。这些展馆所属省区依次是 ( )。

贵州、内蒙古、黑龙江

[单选题]绿地对城市生态环境的作用，下列叙述正确的是

调节城市大气碳氧平衡 有明显的增温降湿效应 减少城市地区日照时间 消除城市大气酸雨污染

[单选题]What is the woman’s seat number?

7A

[单选题]合欢属于( )科。

含羞草

[单选题]铁树叶为羽状复叶，均集生茎顶。( )

错误

解析：解析：“羽状复叶”改为“大型羽状深裂叶”。

[单选题]已知某DNA分子共含有1000个碱基对，其中一条链上A：G：T：C=1：2：3：4。该DNA分子连续复制2次，共需要鸟嘌呤脱氧核苷酸分子数是 （ ）

1800个

[单选题]ASocieties all over the world name places in similar ways. Quite often there is no official naming ceremony but places tend to be called names as points of reference by people. Then an organized body steps in and gives the place a name. Frequently it happens that a place has two names: One is named by the people and the other by the government. As in many areas, old habits died hard, and the place continues to be called by its unofficial name long after the meaning is lost.

many places tend to have more than one name

[单选题]60____

valuable

解析：

形容词valuable表示“做自己作品的观众能给你有价值的新信息”。形容词personal（个人的）、basic（基本的）、delicate（娇贵的、纤弱的、精美的）都与题意不符。本题难度适中。