问题 选择题

下列实验现象的描述中,不正确的是(  )

A.木炭在氧气中剧烈燃烧,发出白光,放出热量,倒入澄清石灰水变浑浊

B.硫粉在氧气中燃烧更旺,火焰呈明亮的蓝紫色,生成有刺激性气味的气体,放出热量

C.红磷在氧气中燃烧更旺,发出白光,产生大量的白烟,放出热量

D.铁在氧气中剧烈燃烧,火星四射,生成四氧化三铁,放出热量

答案

A、木炭在氧气中燃烧,发出白光,放出大量的热,生成能使澄清石灰水变浑的气体,故选项说法正确.

B、硫在氧气中燃烧比在空气中燃烧更旺,发出明亮的蓝紫色火焰,放出热量,产生一种具有刺激性气味的气体,故选项说法正确.

C、红磷在氧气中燃烧比在空气中燃烧更旺,发出白光,产生大量的白烟,放出大量的热,故选项说法正确.

D、铁丝在氧气中剧烈燃烧,火星四射,放出大量的热,生成一种黑色固体;生成四氧化三铁是实验结论而不是实验现象,故选项说法错误.

故选D.

单项选择题
阅读理解

When I was struggling with cancer a few years ago, my wife and I formed our own "couple caution circle".  Anytime a doctor came with news of my progress, my wife would give me a big hug. The reports were seldom good during the early stages of my illness, and one day a doctor brought particularly frightening news. Staring at my reports, he said in a low voice, “It doesn't look like you're going to make it.”

Before I could ask him a question, my wife stood up, handed me my clothes, adjusted the tubes fastened to my body and  said, “Let’s get out of here. This man is a risk to your health.” As she helped me struggle to the door, the doctor came near us. “Stay back,” demanded my wife. “Stay away from us.”

As we walked together down the hall, the doctor attempted to catch up with us “Keep going,” said my wife, pushing the intravenous(静脉注射的)stand. “We’re going to talk to someone who really knows what is going on. Then she held up her hand to the doctor. “Don't come any closer to us.”

The two of us moved as one. We escaped to the safety and hope of a doctor who did not confuse diagnosis with conclusion. I could never have made that walk toward wellness alone.

小题1:.

From the passage we know__________.

A.hearing that her husband was not going to make it, the wife went out of her mind

B.the wife's decision in crisis contributed to the husband’s wellness

C.the husband was diagnosed with cancer by mistake

D.the husband became weaker and weaker as a result of the treatment conducted by the doctor小题2:.

What's the author's feeling when writing the passage?

A.Angry.

B.Thankful.

C.Excited.

D.Sad.小题3:.

What can be inferred from the passage?

A.The wife was a woman hard to get along with.

B.The doctor was a dangerous man.

C.The wife loved her husband very much.

D.The husband was a man who believed everything would be OK.小题4:.

What would be the best title for the passage?

A.A Happy Couple in Crisis

B.Struggle with Cancer

C.In Crisis, Become As One

D.Don't Believe the Doctor