题目

根据短文内容，从方框中选出每段的主旨大意。Mybirthday is on January 24th. I want to ask some friends to my birthday party.OnApril 4th, the students and teachers go on a school trip. We can take some foodand drinks.Hello,I'm Jenny. Look! This is my room. It's on the second floor. It's pink. I have apurple bed. My green bag is on the bed. I like the bag. I have a desk in myroom. There's some books on the table. I like my room.Acomputer game and some keys are in the classroom. Are they yours? Please callme at 613-588.Mybrother likes his school, too. He likes math, but he doesn图中是轮船上悬挂救生艇装置的简化示意图．A、B是船舷上的固定箍，以N1、N2分别表示固定箍A、B作用于吊杆的水平力的大小，已知救生艇所受的重力P=1500N，d=1m，l=0.8m，如吊杆的质量忽略不计，则（　　）A．N1=1200N，N2=0B．N1=0，N2=1200NC．N1=1200N，N2=1200ND．N1=750N，N2=750N