超亲遗传与杂种优势有何异同?

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问题:

超亲遗传与杂种优势有何异同?

考点:生物学动物遗传学动物遗传学题库
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命题“每一个素数都是奇数”的否定是______.

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市内电话收费:前3分钟0.2元,以后每分钟0.1元;长途电话收费:每10秒钟0.1元.丁丁先打了一个市内电话给爸爸,用了6分钟,然后又打了一个长途电话,共花了2.1元的电话费,丁丁打长途电话的时间是多少秒?

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动词填空。

1. Don't forget _________ (turn) off the light before you leave home.

2. What about _________ (eat) turkey slices for dinner?

3. I learned _________ (ride) a bike at the age of six.

4. ________ his father _________ (visit) the Palace Museum in two days?

5. Did you have fun _________ (make) fruit salad?

6. What do you think the weather _________ (be) like tomorrow?

7. You are too fat, you must try _________ (eat) less meat.

8. We enjoy _________ (drink) yogurt.

9. Did it take him a long time _________ (get) here?

10. They often saw Jim _________ (practice) English under the tree last year.

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下列语句中,没有语病的一句是[ ]

A.在故乡。我感到一种久违的轻松与舒适。女儿与村童一道嬉戏在桃红柳绿的乡村景致中,我和妻子则感到了生命中少有的惬意与充实。

B.中国水稻专家说,凭借世界领先的超级杂交稻技术,13亿中国人不但可以吃得好,而且可以吃得饱。 C.有一位医师告诉我,在婴儿身子不适或烦躁时,会哭闹不止,但只要母亲抱一抱,就会很快安静下来。

D.苏轼被贬黄州之时,在当地兴修和奖励了耕织和水利。他刚正不阿,清廉从政,黄州的百姓感念这位父母官,后来修了一座祠庙来纪念这位大文豪。

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