某集气瓶中盛有氮气和氧气的混合气体（体积比为4：1），采用燃烧

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问题选择题

某集气瓶中盛有氮气和氧气的混合气体（体积比为4：1），采用燃烧的方法除去氧气而得到较纯净的氮气时，最好采用的试剂是（　　）

A．铁

B．红磷

C．木炭

D．硫黄

答案

答案：B

阅读理解

阅读理解，回答问题。

Jim is a boy. He is from Canada. He is nine years old. He is a primary school student(小学生).

He can speak Chinese and English. He likes to play football. He is a good student. He is a Young Pioneer

(少先队员), too. Jim has a sister. Her name is Jenny. She is nine, too. She likes English. And she likes

to play baseball.

1. Who is the boy?

He _____ _____.

2. Is Jim a good student?

_____, _____.

3. Is Jenny a Young Pioneer?

_____, _____.

4. Is Jenny Jim's friend?

_____, _____.

5. Are they at the same age?

_____, _____.

单项选择题

男性，28岁，因心悸气短3年，发烧一个月来诊。查体T：37．6℃，睑结膜有一出血点，心率102次／分，心尖部可闻及双期杂音，主动脉瓣区闻及舒张期杂音，脾大肋下1．5cm，有杵状指，Hb：80g/l尿蛋白（+），此患者可诊断为风心病合并（）

A.贫血性心脏病

B.结缔组织病

C.风湿活动

D.感染性心内膜炎

E.上呼吸道感染