Exercise 2: Read the text below and answer the questions. Library Services for Teenagers Many libraries offer services for teenagers, providing information and activities of interest to teens in the community. Teenagers are more independent than younger kids, so parents will have a somewhat different role when it comes to helping them use the library and encouraging them to read for recreation. Books and Magazines In public libraries, teens will find a section of books specifically for them, often called the “Young Adult” section. Not only will teens be able to find resources for their schoolwork, they will be able to find age-appropriate novels and other works of fiction and non-fiction that will be of interest. Libraries also may offer a wide selection of magazines that teens will find appealing on topics such as sports, music, the outdoors, entertainment, and current events. Teens generally like to choose their own books and materials. Computers and Multimedia Many libraries lend CDs and DVDs, and have computers or multimedia programs that are of great interest to teens. Libraries may also offer computer, programming, and design courses. Review your library’s computer use and internet policy with your teen to make sure that he understands and follows all library guidelines, especially if you will not always be accompanying him to the library. Volunteer and Employment Opportunities Libraries often enlist teenagers to help with programs for younger children, such as tutoring summer reading participants, doing puppet and crafts shows, storytelling, and theater productions. In addition, libraries frequently offer part-time job opportunities for teens, both volunteer and paid, to help with such tasks as checking in books and re-shelving materials. Question 1: What is the text mainly about? => Question 2: Where can teens find design courses? => Question 3: What services do libraries offer teenagers? => Question 4: What do libraries often enlist teenagers for? => Libraries often enlist teenagers to help Question 5: What can teens do in libraries to get money? => Question 6: What topics do teen usually like in magazines? => Question 7: What can teens do if they need CDs and DVDs? => Question 8: Where can a teen find the “Young Adult” section? => Question 9: What does the word “them” in the first paragraph refer to? => Question 10: What does the word “they” in the second paragraph refer to? =>

Ở cà chua, biết quả đỏ là tính trạng trội hoàn toàn so với quả vàng và lá chẻ là tính trạng trội hoàn toàn so với lá nguyên. Hai cặp tính trạng này di truyền độc lập với nhau. Cho P có quả đỏ, lá chẻ thuần chủng giao phấn với cây có quả vàng, lá nguyên thu được F1. Tiếp tục cho F1 tự lai với nhau thu được F2. Biết rằng ở F2 thu được 210 cây quả đỏ, lá nguyên. Hãy tính số lượng cây của mỗi tính trạng thu được. - Số cây Quả đỏ, lá chẻ là - Số cây Quả đỏ, lá nguyên là - Số cây Quả vàng, lá chẻ là - Số cây Quả vàng, lá nguyên là

Khi lai dòng chó thuần chủng lông đen, chân cao với dòng chó thuần chủng lông trắng, chân thấp thu được F1 gồm toàn chó lông đen, chân cao. Cho chó F1 tự giao phối với nhau thu được F2. Lập luận và viết sơ đồ lai cho phép lai trên.