用右图装置电解水,一段时间后的现象如图所示.对该实验的描述错误的是( ) A.

题型:选择题

问题:

用右图装置电解水,一段时间后的现象如图所示.对该实验的描述错误的是(  )

A.甲试管中收集到的是一种可燃性气体

B.向水中加入少量硫酸,能增强水的导电性

C.该实验证明了水是由氢气和氧气组成的

D.甲、乙两试管内收集到的气体体积比约为2:1

考点:电解水实验
题型:选择题

What kinds of gifts and things do people buy during ______major festivals like _______Christmas

and _______Spring Festival? [ ]

A. the;不填;the  

B. 不填;the;不填    

C. the;the;the          

D. the;不填;不填

题型:选择题

同一种证券或组合在均值标准差平面上的位置对不同的投资者来说是不同的。( )

题型:选择题

下列有关物质的分离提纯的方法和操作正确的是(  )

A.用分液漏斗分离水和四氯化碳的混合物时,四氯化碳从上口倒出

B.用溶解、过滤的方法分离KNO3和NaCl的混合物

C.可以用酒精萃取碘水中的碘

D.海水通过蒸馏可制得淡水,海水通过蒸发可得到粗盐

题型:选择题

临床可疑嗜铬细胞瘤患者,下列哪一种检查可做定性诊断()

A.B超检查

B.CT扫描

C.核素肾上腺皮质显像

D.核素肾上腺髓质显像

E.MRI检查

题型:选择题

I got a job teaching special education at a school in Coachella, California, a desert town about 170 miles from home. It was no (1) job. Street gangs (2) around the school after dark."Be careful," Dad warned me during one of my frequent weekend (3) home. He was concerned about my living (4) , but I needed to be on my own.One evening, I stayed after school to rearrange my classroom. (5) , I turned out the light and closed the door. Then I (6) toward the gate. It was (7) ! I looked around. Everyone had gone home.After (8) all the exits, I found just enough (9) to squeeze under a gate in the back of the school. Then I walked toward my car, parked in a field behind the building.Suddenly I heard voices. I (10) around and saw at least eight boys following me. (11) my pace, I reached into my shoulder bag to get my key. I (12) all over the inside of my handbag. But the key wasn’t (13) ! Dear Lord, please help me, I prayed (14) . Suddenly, my fingers touched a loose key in my purse. I didn’t even know if it was for my car, but I took it out and (15) it. It worked!I opened the door, slid in and locked it—just (16) the teenagers surrounded the car. Trembling , I started the engine and (17) away. When I returned to my apartment, the phone was ringing. It was my Dad. I didn’t tell him about my experience; I didn’t want to (18) him. "Oh, I forgot to tell you!" He said, "I had a(n) (19) car key made and slipped it into your purse—just (20) you ever need it.

第(4)空应选择()

A.happily

B.far

C.nearby

D.alone

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