下表为元素周期表前四周期的一部分,下列有关B、W、X、Y、Z五种元素的叙述中,正

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问题:

下表为元素周期表前四周期的一部分,下列有关B、W、X、Y、Z五种元素的叙述中,正确的是

[     ]

A.常压下,五种元素的单质中,Z单质的沸点最高    

B.W的氢化物比X的氢化物的稳定性高    

C.Y、Z的阴离子电子层结构都与B原子的相同     

D.Y元素比W元素的非金属性强

考点:元素周期律
题型:选择题

A new school term begins, Is anything new at your school? Sichuan students are getting an extra (额外的)hour to sleep in the morning.

This year, Sichuan schools decided that students should start classes later. This should help them feel less tired, For Junior high schools, the first classes will begin no earlier than 8:30 am.

The changes have made students happy.

Liu Xian, 15, said his class was excited by the news on the first day of school. “It’s so good we can get up later!” said Liu.

Liu studies in Chengdu No.4 Middle School. He used to get up at 6:40 am. Now he can get up at 7:40 am because class doesn’t start until 8:40 am.

Wu Hongli, 15, said the new timetable is good for her health. “I used to drink coffee every night or I would feel to sleepy to finish my homework, ”said Wu. “Now I can finish it without coffee.”She used to get up at 6:30 am. Now she can get up at 7:30 am.

Wu Hongli’s mother was happy, too. She thought more sleep would help her daughter grow taller.

But some parents worried that more sleep would mean less learning. There used to be five classes in the morning. Now there are only four.

Many teachers, though, say the changes will help students learn better.

“Students used to doze(瞌睡)for the first two classes in the morning,”said Wu Zongping, an English teacher at Chendu No.12 Middle School. “But now they look fine and they learn much better than before.”

小题1:What made the Sichuan middle school students happy?

A.The new school term began.

B.Their schools took on a new look.

C.They felt a little bit tired.

D.They could get up later.小题2:In the new term, the first class in the morning in middle schools started at about          .

A.7:00

B.7:30

C.8:00

D.8:40小题3:Why was Liu Xian excited at the news on the first day of school?

A.There were many changes in his school.

B.He could sleep one more hour in the morning.

C.He could study in Chengdu No.4 Middle School.

D.He would have only five classes in the morning.小题4:What did the teachers think of the changes of the school timetable?

A.They didn’t like the changes.

B.They could use the timetable more easily.

C.They spoke highly of the changes.

D.They looked fine when they taught.

题型:选择题

动物生来就有的、由______所控制的行为,称为先天性行为.动物的行为主要受______系统和______系统的调控.

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张某,男,43岁,某县人民法院院长, 1999年7月14日,因涉嫌受贿被县人民检察院提起公诉。根据上述案情,请回答下列问题。

假设本案中,秦某是张某同案犯,如果张某聘请了辩护律师,则人民法院对于没有委托辩护人的秦某可以采取以下哪些或哪个做法

A.要求秦某委托辩护人

B.必须为秦某指定辩护人

C.可以为秦某指定辩护人,即使秦某本人并非经济困难

D.只有当秦某经济困难而无力聘请辩护人时,才应为其指定辩护人

题型:选择题

超短波的微热量(Ⅱ级剂量)适合于哪类疾病治疗

A.急性炎症早期
B.亚急性、慢性疾病
C.水肿显著
D.血液循环障碍部位
E.急性肾功能衰竭

题型:选择题

如何利用它感作用防除杂草?

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