A:R基为-CH3和-C3H5O2的二肽分子中,H数目为6
B:纤维素、血红蛋白的单体分别是葡萄糖和氨基酸
C:DNA由两条核糖核苷酸链构成,RNA由一条脱氧核苷酸链构成
D:脂肪既是细胞内良好的储能物质,又是构成细胞膜的重要成分
谁率领的船队首次实现人类环绕地球一周的航行( )
Dear students,
An English lecture will be held in the lecture hall from 4 to 6 p.m. On March 7. It will be given by Professor Li Ping from Peking University. The topic is “How to learn English well”. You may take notes if you like. And you may ask questions about learning English during the break. If you are interested, please attend the lecture on time.
English Club
March 2, 2017
Dear all students,
March 12 is Tree Planting Day. We have decided to go and plant trees that day. All the students in our school are supposed to take part in this activity. We are going to gather at the school gate at 7:00 tomorrow morning. And then, we will take our school bus to West Hill. Please don't be late or absent. Pay attention to safety during the planting. Please wear sports shoes as well.
Student Union
March 11, 2017
Found
A jacket was found on the playground on the afternoon of March 1. It is a new black jacket. There is a key in the pocket. The owner can come to Room 201, Building 3 to get it.
Li Hua
Class 3, Grade 8