【名词&注释】
平均值(average)、自然界(nature)、相对原子质量(relative atomic mass)、质量数(mass number)、原子核(nucleus)、核外电子(extranuclear electron)、从左到右(from left to right)、空白处
[单选题]地衣表现的各种色彩主要是由于上皮层中含有大量色素所致。( )
A. 正确
B. 错误
查看答案&解析
点击获取本科目所有试题
举一反三：
[单选题]
B．Besides
C．However
D．Then
A. ThereforeB．Besides
B. However
C. Then
[多选题]第二节 根据对话内容，从对话后的选项中选出能填入空白处的最佳选项—Debbie！I can’t believe it！I haven’t seen you for ages.
A. —Dorothy！it’s really a nice surprise！61
B. —pretty good.
C. —62
D. —I wish I could. But I’m on my way out. I have to be in the city in an hour.
E. —63
F. —there’s a lot of traffic and I really have to get going. You know where I live — why don’t you drop in one evening?
G. — I’ll do that. 64 let’s keep in touch.
H. — I’d really like to. I’ll talk to you soon, Debbie. I’m glad I ran into you.
I. — 65
J. take care.
K. How are you?
L. Where have you been?
M. Can you join me?
N. Come on. Just for a minute.
O. F. And you should feel free to call or visit me.
P. G. It’s been a whole year since we saw each other last time.
[单选题]某元素只存在两种天然同位素，且在自然界它们的含量相近，其相对原子质量为152.0，原子核外的电子数为63。下列叙述中错误的是
A. 它是副族元素 B．它是第六周期元素
B. 它的原子核内有63个质子
C. 它的一种同位素的核内有89个中子
[单选题]How did the calf feel about the mother elephant’s roaring?
A. It was a great comfort.
B. It was a siga of danger.
C. It was a call for help.
D. It was a musical note.
本文链接：https://www.zhukaozhuanjia.com/download/4dxg90.html
