题目

构成DNA分子的四种脱氧核苷酸的种类不同，取决于 A．五碳糖的不同                    B．含氮碱基的种类 C．磷酸分子的多少                  D．碱基对的排列顺序 答案：BDear Emma,Thanks for the photo of your family. Here is a photo of my bedroom.Look at the photo. A bed, a desk, a chair, a bookcase and a computer are in my bedroom. My bed is near the window(窗户). The desk is beside（在旁边） the bed and it’s orange. The chair is near the desk. The bookcase is behind（在后面） the desk and it’s black. An English dictionary and a Chinese dictionary are in the bookcase. My math, English and Chinese books and the computer are on the desk. My pencil box is on the desk, too. My pens and rulers are in the pencil box. My schoolbag is on the chair. My brother’s white baseball and my sister’s computer game are under my bed, but you can’t see the baseball in the photo.Yours,Jack1.It is a photo of ________ bedroom.A. Emma’s B. Jack’sC. Jack’s brother’s D. Jack’s sister’s2.The desk is __________.A. behind the bed B. not in the roomC. near the window D. beside the bed3.You can’t see _________ in the photo.A. the math book B. the baseballC. the English dictionary D. the computer4.The bookcase in the photo is __________.A. black B. white C. orange D. blue5.Which of the following is NOT true?A. Two dictionaries are in the bookcase.B. The pens are in the pencil box.C. The schoolbag is under the chair.D. The baseball is Jack’s brother’s.