Trying new things is the only way we can discover hidden talents. I 1 my career as an editor for a magazine. I didn't really mind the work, but I wanted something more 2Then I was offered a management 3 of a digital reading company. The job was a seemingly 4 mix of my skills and interests, so I jumped at it.

    5, soon after I joined the company, its model changed to focus on K-12 education, and everything about my position changed. I was asked to take on the 6 different roles of selling content to teachers and training people. I felt more than a little 7 my comfort zone.

    I knew I wanted to grow as a(an)8 and make a serious effect on the company. I told myself that everything feels 9 at first and I should at least try.10 I felt like I didn't have a(an)11. I knew jumping out of the 12 was the right thing for me, even though it felt pretty awful.

    I was fortunate to be 13by very helpful people, both at work and at home. They kept 14 me. I spent hours researching my company's 15. I asked lots of questions and spoke to many people in need. I looked for opportunities to put in extra 16 .The more I did, the better I felt.

    Over time, I discovered that the job was17I could do and liked doing. It was an amazing 18 to see the company grow and know that my efforts contributed to 19success and that it's important to take risks and accept new 20. Actually, there's nothing worse than failing because you refuse to even try.

已知$a={\log }_{\frac{1}{3}}2,b={\log }_{\frac{1}{2}}\frac{1}{3},c={\left(\frac{1}{2}\right)}^{0.3}$， 则（  ）．

研究发现两种现象：①动物体内的B细胞受到抗原刺激后，在物质甲的作用下，可增殖、分化为效应B细胞；②给动物注射从某种细菌获得的物质乙后，此动物对这种细菌具有了免疫能力。则这两种物质中（   ）

澳大利亚特有生物众多的原因是（    ）