瓦斯是（）的气体，具燃烧性、爆炸性、无毒但也无助于呼吸。必须_爱下问搜题

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问题多项选择题

瓦斯是（）的气体，具燃烧性、爆炸性、无毒但也无助于呼吸。必须用仪器检测才能发现。浓度增加，则氧气浓度相对降低，从而使空气具有窒息性。

A.无色

B.无味

C.无臭

D.有异味

答案

参考答案：A, B, C

单项选择题

某男性工人，长期接触汞，近来出现全身乏力、失眠、牙齿松动等症状。不久后，脾气开始暴躁，家人甚至以为他得了精神病。

为确定汞中毒应进行的实验室检查是()

A．检测血中ZPP含量

B．测定红细胞中FEP含量

C．驱汞试验

D．测定血中白细胞数量

E．测定血红蛋白含量

完形填空

Growing older is unavoidable while growing up is optional. These words have been passed on in the loving __ of Rose.
On the first day of school our professor challenged us to get to know someone, so I __ to find a little old lady looking at me with a smile. She said， "Hi,handsome! My name is Rose. I'm eighty-seven years old. Can I give you a _? " I laughed and _ responded, then followed a giant squeeze. “_ are you in college at such an innocent age?” I asked. "I'm here to meet a rich husband, get married, have a couple of kids..." I was __ what it was that motivated her to be taking on this _ at her age. “ I always dreamed of having a college education and now I _ it!” Later, we became friends.
Rose became a campus celebrity and she easily made friends _ she went. On one _ Rose was invited to speak at our football banquet. Her prepared cards dropped before she _ the speech. A little _ , she simply _ her throat and began," We do not stop playing _ we are old; we grow old because we stop playing. There are certain secrets to stay _ , being happy and achieving success. You've got to have a dream. When you _ your dreams, you die.”…
At the end of the year Rose finished her college education. One week after graduation Rose died _ in her sleep. Over two thousand college students _ her funeral in honor of the wonderful woman who taught by __ that it's never too late to be all you can possibly be.
Anybody can grow older, which doesn't _ any talent or ability. The key is to grow up by always finding opportunities in change.

B． turned over

C． turned around

D． turned away

B． impatiently

D． enthusiastically

B． opportunity

D． invitation

A． remembered

B． embarrassed

C． fascinated

D． frightened

C． peacefully

B． directions

D． personality