题型:填空题 补全下列句子。A: Excuse 1 , what's 2 , please? B: My name 3 Ann Read. And your name ? A: Wei Hua, 4 are you ? B: Fine, thank you. A: Is it a pear 5 the bag (书包) ? B: No, It's 6 orange. A: What 7 that in English? B: It's a bus, a 8 bus. A: 9 . Can you 10 "bus"? B: Yes, I can. b-u-s, bus. ( )1. A. my ( )2. A. that ( )3. A. is ( )4. A. How ( )5. A. in ( )6. A. × ( )7. A. is ( )08. A. China ( )9. A. Sorry ( )10. A.say B. me B. it B. am B. What B. for B. a B. are B. Chinese B. Excuse me B. look C. I C. your name C. are C.Who C. to C. an C. am C. English C. Good C. spell 查看答案
题型:填空题 关于下图所示DNA分子的说法,正确的是[ ]A.限制酶作用于①部位,DNA连接酶作用于③部位B.该DNA的特异性表现在碱基种类和(A+T)/(G+C)的比例上C.若该DNA中A为p个,占全部碱基的n/m(m>2n),则G的个数为(pm/2n)-pD.把该DNA放在含15N的培养液中复制两代,子代中含15N的DNA占3/4 查看答案