I was only nine years old when I learnt how to use a computer．My mother is my first teacher．I know how to type，how to copy a file，and how to visit a website on the Internet．One day，mom was not at home．I turned on the computer and began to learn how to chat on net．The first one I met there was a boy called Tom．He greeted me politely．When he knew that I was only a 9-year-old girl and almost knew nothing about chatting on net，he started showing me how to use the chatting tools，how to download，and how to send e-mails．I learnt a lot from him．

函数f（x）=Asin（ωx+φ）（A＞0，ω＞0，0＜φ＜π）的图象如图所示，则f（$\frac{\mathrm{\pi }}{4}$）的值为（　　）

1976年，美国的H．Boyer教授首次将人的生长抑制素释放因子的基因转移到大肠杆菌，并获得表达。此文中的“表达”是指该基因在大肠杆菌中     （   ）