搜题请搜索小程序“爱下问搜题”
问题 单项选择题 A1/A2型题

乙肝病毒的“两对半”结果中，传染性最高的患者通常是（）

A.HBsAg（-）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（-）

B.HBsAg（+）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（-）

C.HBsAg（+）抗HBs（-）HBeAg（-）抗HBe（+）抗HBc（+）

D.HBsAg（+）抗HBs（-）HBeAg（+）抗HBe（-）抗HBc（+）

E.HBsAg（-）抗HBs（-）HBeAg（-）抗HBe（-）抗HBc（+）

答案

参考答案：D

阅读理解

It’s the second time for me to come to Beijing. There are many places of interest in Beijing, such as the Summer Palace, the Great Wall, etc. What’s more, I think great changes have taken place in Beijing. People’s living conditions have improved a lot. Their life is very happy. Almost everyone has a big smile on the face. People in Beijing are in high spirits and hard-working. Children can receive a good education.

But in the past, some children didn’t have enough money to go to school. They often worked for cruel bosses. The bosses didn’t give them enough food. I feel sorry for them. Today people have already lived in tall building, worn beautiful clothes and so on. Life has changed greatly.

小题1:How many times has the writer been to Beijing?

A．Once

B．Twice

C．Three times

D．four times小题2: People’s living conditions have improved ___________in Beijing.

A．a lot

B．little

C．few

D．slowly小题3:Today, our life is __________.

A．very happy

B．very bad

C．very interesting

D．just so-so小题4: People in Beijing work ________.

A．slowly

B．hard

C．happy

D．low spirits小题5:In the past, children had _______ education. 

A．enough

B．high

C．good

D．bad
查看答案
选择题

下列说法不正确的是 [ ]

A．用饱和Na2CO3溶液除去乙酸乙酯中混有的乙酸和乙醇

B．电解精炼铜时，相同时间内阳极溶解铜的质量比阴极析出铜的质量小

C．将溴乙烷与NaOH溶液共热后冷却，再滴加硝酸银溶液检验水解产物中的溴离子

D．硫酸工业中，在接触室安装热交换器是为预热反应气体，达到适宜的反应温度

查看答案