【单选题】In Unit 2. Arriving at the airport in Seattle, the boy, now a young man, called Information Please again to find _________.
A.
she no longer worked there
B.
she didn't like his call at all
C.
she had forgotten all about him
D.
they both meant a lot to each other
【单选题】N A 代表阿伏加德罗常数,下列说法正确的是
A.
0.5 mol Al 与足量盐酸反应转移电子数为1 N A
B.
标准状况下,11.2 L SO 3 所含的分子数为0.5 N A
C.
0.5 mol CH 4 所含的电子数为1 N A
D.
46 g NO 2 和N 2 O 4 的混合物含有的分子数为1 N A
【简答题】Unit5 Topic2 SectionD 预习检测 一、 根据首字母 或 汉语提示补全单词。 1. —Is Jeff the only child in his family? —No, he has an e______ brother. 2. I want to stay alone. Please don’t let a______ in. 3. Jack r______( 拒绝 ) to...
【单选题】听 Passage in Unit 2 ,Book 1 6. What did people find out about the boy who lived in a jungle?
A.
He walked like monkeys
B.
His parents left him in the jungle
C.
His knees were damaged by monkeys
D.
He spent his whole childhood in a jungle
【单选题】设NA为阿伏加德罗常数,下面叙述正确的是 [ ]
A.
标准状况下,11.2L SO 3 所含分子数为0.5 NA
B.
1L 1mol/L的氯化钠溶液中,所含离子数为NA
C.
常温下,4.4g CO 2 和N 2 O(不反应)混合物中所含有的原子数为0.3 NA
D.
一定量的铜与足量的浓硫酸反应,放出2.24L气体时,转移电子数为0.2 NA
【判断题】骨干排水系统应充分考虑引水灌溉.航运和水产养殖等综合利用的要求。
【简答题】(8分)某有机物11g完全燃烧,生成9gH 2 O和11.2LCO 2 (标准状况下), (1)求该有机物的最简式: (2)若0.5mol此有机物的质量为44g,则该有机物的分子式: 。 (3)若此有机物无酸性,1mol此有机物能与足量的金属钠反应生成标准状况下氢气22.4L,也能使溴的四氯化碳溶液褪色,此有机物中的每个碳原子上只连接一个官能团。则它可能的结构简式(写出两种) 、
【单选题】In Unit2. After the family moved to Boston, the boy ________.
A.
called Information Please again
B.
never thought of her again
C.
missed his friend deeply
D.
forgot his friend soon
【单选题】在进行系统分析和系统设计时,一般使用( )来进行数据结构的分析与设计,以建立数据表。
【单选题】用N A 代表阿伏加德罗常数,下列说法正确的是 [ ]
A.
0.5mol Al与足量盐酸反应转移电子数为l N A
B.
标准状况下,11.2 L SO 3 所含的分子数为0.5 N A
C.
0.1 mol CH 4 所含的电子数为1 N A
D.
46 g NO 2 和N 2 O 4 的混合物含有的分子数为1 N A