题干

转基因动物基因时的受体细胞是(    )

A:受精卵

B:精细胞

C:卵细胞

D:体细胞

上一题 下一题 0.0难度 选择题 更新时间:2015-06-29 10:52:37

答案(点此获取答案解析)

A

同类题2

阅读下文,回答问题。

一个美丽的故事

      ①有个塌鼻子的小男孩儿,因为两岁时得过脑炎,智力受损,学习起来很吃力。打个比方,别人写作文能写二三百字,他却只能写三五行。但即便这样的作文,他同样能写得美丽如花。

      ②那是一次作文课,题目是《愿望》。他极其认真地想了半天,然后极其认真地写,那作文极短,只有三句话:我有两个愿望,第一个是,妈妈天天笑眯眯地看着我说:“你真聪明。”第二个是,老师天天笑眯眯地看着我说:“你一点也不笨。”

      ③于是,就是这篇作文,深深地打动了他的老师,那位妈妈式的老师不仅给了他最高分,在班上带感情朗诵了这篇作文,还一笔一画地批道:你很聪明,你的作文写得非常感人,请放心,妈妈肯定会格外喜欢你的,老师肯定会格外喜欢你的。大家肯定会格外喜欢你的。

      ④捧着作文本,他笑了,蹦蹦跳跳地回家了,像只喜鹊。但他并没有把作文本拿给妈妈看,他是在等待着一个美好的时刻。

      ⑤那个时刻终于到了,是妈妈的生日——一个阳光灿烂的星期天。那天,他起得特别早,把作文本装在一个亲手做的美丽的大信封里,信封上画着一个塌鼻子的男孩儿咧着嘴笑得正甜。他静静地看着妈妈,等着妈妈醒来。妈妈刚睁开眼醒来,他就甜甜地喊了声“妈妈”,然后笑眯眯地走到妈妈跟前说:“妈妈,今天是您的生日,我要送给您一件礼物。”

      ⑥妈妈笑了:“什么?”

      ⑦他笑笑:“我的作文。”说着双手递过来那个大信封。

      ⑧接过信封,妈妈的心在砰砰地跳!

      ⑨果然,看着这篇作文,妈妈甜甜地涌出了两行热泪,然后一把搂住小男孩儿,搂得很紧很紧,仿佛他会突然间飞了。

      ⑩是的,智力可以受损,但爱永远不会,它朝气勃勃,永远垂着绿荫,开着明媚的花,结着芳香的果。

同类题3

阅读理解

    It's the holiday season, the time when we connect with family and friends. Social media sites like Twitter and Facebook are full of festive pictures, featuring parents' catching and sharing those special family moments, their child's wish list, and maybe even a cute video of their child dancing to “Jingle Bell Rock” while wearing a diaper (尿片) and Santa hat. Swelling with pride, parents can't wait to get approval with a “thumbs up” or better yet a personalized message on their treasured post.

    Adults should be able to post what they want online. However, when exposing family moments online, are they sharing too much information? Do parents have the right to share those cute now, but embarrassing later moments about kids? Have children willingly given their agreement to sharing their cute but funny video online?

    A recent study found that 75% of parents turn to social media for parenting-related information and social support. There is even a term used to describe the overuse of sharing too much information about kids on social media: “sharenting”. Research also finds that “sharenting” isn't going anywhere anytime soon. What's troublesome is that a typical parent has about 150 Facebook friends and only a third of them are actual friends. So that brings up good questions – Who are we really sharing our information with and why? Who knows when and where that photo could resurface in the future?

    While there's no reliable information on how young children feel about things posted online, we do have information about how teens feel. According to a report by the Family Online Safety Institute, 76% of teens are concerned about their privacy. Many teens constantly search for new apps that allow anonymity. When names are required, they use screen names that don't reveal real information. If our teens are doing a better job of protecting themselves online, shouldn't parents take the lead and do the same? Plus, with more and more college admission representatives and potential employers surfing the internet for potential candidates, we'd hate for one of our posts to change an important decision. Think about it … online reputations are now becoming inseparable with real life ones.

    Of course, we can secure our privacy settings, only allowing our friends to view pictures, posts and videos, but that doesn't stop others from uploading our pictures. Adults need to be cautious of sharing information online, especially information about children.

    So, this holiday season, enjoy family time and share those special memories with family and friends. Before clicking the app to upload photos or videos, stop and think twice.