1.2+0.3 =____       5.4-2.3=____       0.65+0.35 =____    1-0.09 =____

6.85+1.05 =____   4.89-2.7 = ____   10-9.9 =____          3.27+0.73=____

4.2-4 =____           5.1-2.1 =____      4.3 +2.7 =____       5+ 4.4 =____

阅读下列材料:

材料一　我们不但要有更多的飞机和大炮,而且还要有原子弹,在今天的世界上,我们要不受人家欺负,就不能没有这个东西。

——***

材料二　中国第一颗原子弹爆炸成功后,国务院总理周恩来致电世界各国政府首脑,阐明中国对于核武器问题的立场:中国政府一贯主张全面禁止和彻底销毁核武器,中国进行核试验、发展核武器,是被迫而为的。中国掌握核武器,完全是为了防御,为了保卫中国人民免受核威胁。中国政府郑重宣布,在任何时候,任何情况下,中国都不会首先使用核武器。

请回答:

图甲、乙、丙分别表示某种二倍体生物的三个正在进行分裂的细胞．请据图回答下列问题：

（1）该生物体细胞中染色体数目是____ ．

（2）图中属于减数分裂的细胞是____ 和____ ．

（3）含有同源染色体的细胞是____ 和____ ．

（4）丙细胞中含有____ 条染色单体．

用方框中所给单词的适当形式填空, 使短文意思完整、通顺。

    Before graduation, many classmates were busy ____ for jobs. So was I. It was very difficult to find a job in the big city. I had been ____ for many times until I found a want ad for an editor. “If you could find ____ than 10 wrong words in the newspaper, you can work ____ an editor,” the ad said. I loved literature(文学) and had written several little ____ for the newspaper. So I decided to have a try. It was the final date when I saw the newspaper. I told one of my roommates the news happily. After he ____ the news, he smiled and said “Today is April Fool's Day. It may just be an April Fool's ____. A fool may take it ____.” I was very disappointed after hearing that, but I still wanted to have a try. It took me the whole morning to find 12 wrong words in the newspaper. I ____ at the editorial department in the afternoon and got the job immediately.

    Later I knew I was the only applicant(申请者).I got a lesson from the experience: Something others said was ____ may be not impossible. As long as you believe it, you may make impossible possible.