分别将下列各组物质同时加到水中,能大量共存的是( ) A.NaCl、AgNO3、

题型:选择题

问题:

分别将下列各组物质同时加到水中,能大量共存的是(  )

A.NaCl、AgNO3、Na2SO4

B.H2SO4、NaCl、Na2CO3

C.Na2SO4、KNO3、NaOH

D.BaCl2、NaCl、K2SO4

考点:复分解反应离子的共存
题型:选择题

阅读短文,选择正确答案。

    Now the students of Class Three, Grade One are having an English lesson, Mr Zhang finds Li Lei doesn't

listen to him. He goes to Li Lei and has a look. Oh, Li Lei is drawing a boy.

    The teacher asks Li Lei to stand up. "Do you like drawing?" 

    "Yes, Mr Zhang," answers Li Lei, "And I draw very well." 

    "You can draw after class, I think," says the teacher. "You can't draw anything in class." 

    "You are wrong, Mr Zhang. I can draw when I am having an art class. And I like it very much," says Li Lei

with a smile. 

    "You are right," says the teacher. 

    "And you must draw one hundred boys before the class is over," says the teacher angrily.

    After five minutes, Li Lei finishes drawing and puts up his hand. The teacher looks at the picture and asks,

"I ask you to draw one hundred boys. But you draw only two boys. One is standing at the door and the other

one is standing in front of the window. Where are the others?" "There are ninety-eight boys in the room, you

know," says Li Lei.

1. Mr Zhang is ________ teacher and Li Lei is good at ________. [ ]

A. a Chinese, lessons

B. a math, drawing

C. an art, football

D. an English, drawing

2. The underlined sentence (划线句子) in the text means _________. [ ]

A. the boy can draw nothing

B. the boy can't draw in art class

C. the boy can't draw in an English class

D. the boy likes drawing after class

3. Li Lei draws two boys _________. [ ]

A. on the paper

B. on his desk

C. on the blackboard

D. on the wall

4. What do you think the teacher will do after class? [ ]

A. He will let the boy go home

B. He will ask the boy to go to his office

C. He will praise (表扬) Li Lei

D. He will ask Li Lei to dinner

5. From this story we know that Li Lei is a ________ boy. [ ]

A. good

B. clever

C. bad

D. kind

题型:选择题

当太阳直射点位于南回归线上时,马鞍山为(  )

A.春分日

B.夏至日

C.秋分日

D.冬至日

题型:选择题

某市为了解七年级学生的视力情况,随机抽取了500名学生进行检测,其中有400名学生的视力达标.请你估计该市6万名七年级学生中,视力达标的大约有______万人.

题型:选择题

原位溶血表示红细胞的破坏主要在()

A.骨髓

B.血管内

C.组织中

D.肝脏

E.脾脏

题型:选择题

按照道路旅客运输企业等级条件的要求,一级企业与二级企业指标要求相同的是( )。

A.经营业绩

B.安全状况

C.投诉次数

D.运输能力

E.营运客车新度系数

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