青蛙、蟾蜍等两栖类动物的生殖与发育方式是（　　）

“娃娃博士”谱写核弹新篇章

    蜚声中外的邓稼先是我国功高盖世的核弹元勋。他二十多岁就在美国获得了物理学博士学位，因而被他的老师爱称为“娃娃博士”。

    从“娃娃博士”到“核弹元勋”，邓稼先走过的路闪耀着理想的光辉，智慧的火花，更展示出惊人的开拓进取精神！

    1959年6月，邓稼先被委任为我国第一额核弹研制工程的理论设计负责人。

    理论设计是研制核弹的第一大关。邓稼先一无现成的资料，二无先进的设备，三无点滴经验。他怀着一颗忠于祖国、献身科学的赤子之心，带领一批年轻的科学家用古老的算盘、简陋的计算尺和手摇计算机，日夜三班轮换，千万次地重复着单调、机械的工作。计算的工作量是常人难以想像的：计算、验算、校对、修正……一次、两次……花了近三百个日日夜夜，直到与其他科学家从另一个角度对数核查无误，研制核弹的第一个难关才被攻克。

    邓稼先不仅在科研院所里费尽心血，还经常亲自到飞沙走石的戈壁试验场。1964年10月，中国成功爆炸第一颗原子弹，他率领研究人员在试验后迅速进入爆炸现场采样。接着又投入了对氢弹的研究，并于原子弹爆炸后的两年零八个月试验成功，同美国用七年、苏联用四年、法国用八年的时间相比，创造了世界上最快的速度。

    1986年7月29日邓稼先去世。临终前，他留下的话仍是如何在尖端武器方面的努力，他说：“不要让人家把我们落得太远……”

“娃娃博士”谱写核弹新篇章

    蜚声中外的邓稼先是我国功高盖世的核弹元勋。他二十多岁就在美国获得了物理学博士学位，因而被他的老师爱称为“娃娃博士”。

    从“娃娃博士”到“核弹元勋”，邓稼先走过的路闪耀着理想的光辉，智慧的火花，更展示出惊人的开拓进取精神！

    1959年6月，邓稼先被委任为我国第一额核弹研制工程的理论设计负责人。

    理论设计是研制核弹的第一大关。邓稼先一无现成的资料，二无先进的设备，三无点滴经验。他怀着一颗忠于祖国、献身科学的赤子之心，带领一批年轻的科学家用古老的算盘、简陋的计算尺和手摇计算机，日夜三班轮换，千万次地重复着单调、机械的工作。计算的工作量是常人难以想像的：计算、验算、校对、修正……一次、两次……花了近三百个日日夜夜，直到与其他科学家从另一个角度对数核查无误，研制核弹的第一个难关才被攻克。

    邓稼先不仅在科研院所里费尽心血，还经常亲自到飞沙走石的戈壁试验场。1964年10月，中国成功爆炸第一颗原子弹，他率领研究人员在试验后迅速进入爆炸现场采样。接着又投入了对氢弹的研究，并于原子弹爆炸后的两年零八个月试验成功，同美国用七年、苏联用四年、法国用八年的时间相比，创造了世界上最快的速度。

    1986年7月29日邓稼先去世。临终前，他留下的话仍是如何在尖端武器方面的努力，他说：“不要让人家把我们落得太远……”

    Last week I was in the boarding（登机）area of the airport excited about my Christmas trip home to see my parents. I was busy planning for the weekend,1 I was taken out of my daydreaming by an elderly woman talking 2 into her cellphone. She kept asking the person to 3 her where she was. She 4 the gate number again and again. She got a little louder each time she did that. Many people snickered（窃笑）because she was nearly 5 and thought how silly old people could be.

    Then I heard her say, “I'm 6, but I can't hear you. There seems to be something wrong with my hearing aid.” “That's too 7” I thought as I moved forward to board the flight. Then I noticed her 8 was becoming increasingly frantic（发狂似的）as she tried to understand the person on the other end of the phone. It was almost my 9 to board. I couldn't 10 looking back at the woman. It made me think how 11 I was to have my hearing. And I realized I could offer her some 12.

    I suddenly got out of the 13 and went to the woman. I showed her to 14 me the phone and shouted, “Let me help you. I'll tell you what the person is 15.” She looked at me and agreed 16. I took the phone from her,17 who I was, listened for a moment, and told the woman her husband was 18 her outside the airport as he could not enter the gate area. Finally, I pointed her in the 19 direction.

    It took me less than two minutes to finish the task, but my 20 in having been able to help her remains strong.