已知四边形ABCD，对角线AC、BD交于点O．现给出四个条件：①AC⊥BD；②A

读短文判断正误，正确的画()错误的画()。

      Today is Sunday. It's sunny. I go to the park with my friends Ruirui and Tongtong. We walk slowly

in the park. Ruirui is a girl. She likes flowers. She takes a picture of a flower. Tongtong is a boy. He likes

playing in the park. I'm a girl, too. I  like flying kites. We are having fun.

( ) 1. It's Sunday today.

( ) 2. Ruirui,Tongtong and I are girls.

( ) 3. We walk quickly in the park.

( ) 4. Ruirui takes a picture of Tongtong.

阅读理解。

     Hello! This is my family. I'm David Green. I'm from England. My family is in Beijing. My father and mother work here. My father is a doctor and my mother is a teacher. I have a sister but no brothers. My sister and I

are students of a middle school in Beijing. We love China. My home is very nice. My family has a TV and a

computer. My room (房间) is big. I have a bed (床), a desk (桌子) and two chairs (椅子) in it. My books are

on my desk. I have an MP3 in my bag. There are some pictures on the wall. I like my room and I like these

pictures very much.

根据短文内容,判断正(T)误(F).

( )1. Four people are in David's family.

( )2. Mr. and Mrs. Green have a son and a daughter.

( )3. David's father works in a school in Beijing.

( )4. Two chairs and a desk are in David's room.

( )5. — Is an MP3 on David's desk? 

       — No, it isn't.

简述中日《修好条规》。

有利于强降水超级单体风暴产生的环境条件是（）。

A.丰富的低层水汽

B.较高的LFC

C.较低的LFC

D.弱的对流前的逆温层顶盖

磁开关的分隔间隙分为A、B、C三类。C类间隙是（）。

A.大于40mm

B.大于60mm

C.大于80mm

D.大于100mm