下列对生产、生活有关化学问题的分析不正确的是 A．白色污染_爱下问搜题

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问题选择题

下列对生产、生活有关化学问题的分析不正确的是

A．白色污染是指聚乙烯、聚氯乙烯等塑料垃圾

B．吗啡、海洛因等虽然有麻醉、止痛、镇静作用，但易上瘾且有害，这类物质属于

毒品

C．为保证人体所需要的足量的蛋白质，我们应多吃肉，少吃蔬菜和水果

D．青霉素等抗生素对病原体有抑制和杀灭作用，这是“治本”而不是“治标”

答案

答案：C

答案：C

C、不正确，要注意营养均衡。

单项选择题

有如下程序　　#include＜iostream．h＞　　void main( )　　{　　　float x=2．0，y；　　　if(x＜0．0)y=0．0；　　　else if(x＜10．0)y=1．0/x；　　　else y=1．0；　　　cout ＜＜ y；　　}　该程序的输出结果是（）。

A． 8K

B． 16K

C． 32K

D． 64K

完形填空

Sarah came running in. She shouted happily, "Look what I ____36_____." She put a snake skin on the newspaper I was reading and it came so suddenly that it caused me to ____37_____. "Mom, look! Isn't it ____38_____?" said my seven-year-old daughter. I ____39_____ the snake skin and thought that it really wasn't pretty. Everything children see ____40_____is full of beauty in their eyes; they see only ____41_____ and excellence in the world until educated.
"____42_____ did the snake do this?" Sarah asked. I tried to seize the ____43_____ to teach my children that there was almost always something beyond the obvious. I wanted to tell them that there was something else going on ____44_____ what they saw in front of them. "Snakes shed (蜕) their skin because they need to renew themselves," I ____45_____.
"Why do they have to renew themselves?" Sarah asked.
My son Robert laughed and said, "Because they don't ____46_____ what they are and they want to be someone else." I politely ignored him and said that by shedding skins, we could ____47_____ the hidden reality.
"We often need to shed our skin, those coatings that we ____48_____ ourselves with," I said to my children, who listened very ____49_____, with their eyes wide open. "This snake ____50_____ needs this skin. It is probably too hard for him, or he probably doesn't think he looks as ____51_____in it as he once did. It's like buying a new ____52_____."
I'm sure this explanation will not ____53_____ the naturalists. But Sarah was getting to understand that renewal is part of ____54_____. She should learn from it what we need to keep and what we need to ____55_____.

A．interesting

C．referred to

D．brought back

A．by accident	B．over and over again
C．in the future	D．for the first time

A．information

B．possibility

C．opportunity

B．attentively

B．achievement

D．competition