问题 选择题

青少年学生是建设文化型社会的主力军,应“以崇尚科学为荣、以愚昧无知为耻”.下列说法没有科学性的是(  )

A.因为地壳中铁元素比铝元素多,所以铝的价格比铁贵

B.将水煮沸后能形成水垢,这种水不能用于锅炉用水

C.用硫燃烧法熏蒸粉丝和生姜,虽然好看,但不利于健康

D.绿色化学制造出的产品不一定是绿色

答案

A、铝冶炼困难,用电解法制备,铁用热还原的方法制备;碳热还原成本要明显低于电解,因此铝明显比铁成本高,所以要贵,故A说法错误;

B、将水煮沸后能形成水垢,说明为硬水,这种水不能用于锅炉用水,否则时间长了会引起锅炉爆炸,故B说法正确;

C、用硫燃烧法熏蒸粉丝和生姜,虽然好看,但会产生二氧化硫,有毒,不利于健康,故C说法正确;

D、绿色化学是从源头上消除污染,制造出的产品不一定是绿色,故D说法正确.

故选A.

阅读理解

以下四人正在寻找一些网站,阅读以下五段不同网站的介绍(A、B、C、D、和E),对应选出正确答案,并在答题纸上将该选项标号涂黑。A、B、C、D、和E选项中有一项是多余选项。

1. Jasper enjoys listening to music. He is expecting to find a website where he could search for various songs with similar tunes that he prefers.

2. Luke is planning to buy a car. But right now he has not made up his mind. He prefers Mazda RX-8. He wants to find more information about this car to make sure that it is a good choice.

3. This Sunday is Valentine’s Day. Roderick is still deciding what kind of presents he should buy for his girlfriend. He prefers to have something traditional, like chocolate.

4. Fiona is retired. She begins to pay attention to her health. What interests her most now is how to remain healthy and young. She always surfs on the internet for such information.

A. Naturespath.com is an excellent health-food website. “Life enhancement expert” Allan Hunkin interviews such guests as nutrition expert Dr. David Katz and tri-athlete Melanie McQuaid. They talk up health food and weight management, including debates on the benefits of whole grain and organics.

B. Autoblog.com tops the category by covering “auto industry news from A to Z.” They discuss hundreds of car models and links to outside articles for more information. While the site provides no reliability reviews, its “royal and growing fan base” comments frequently on the entires.

C. Mrchocolate.com—The Consumer Reports “best buy” for “unusual” chocolates for the one you love. Jason’s choice is 50 pieces of small dark, milk, and white chocolate with offbeat (标新立异的) centers, including coffee, nut butter, and tropical fruit.

D. Carpet-rug.org— The Carpet and Rug Institute awards a “Green Label” to vacuums (真空吸尘器) that release fewer than 100 micrograms of dust particles per cubic meter of air. Find a list at this site.

E. Pandora.com takes one of your favorite tunes, then suggests songs that you might enjoy. Pandora offers 10 hours of free use, then charges $ 36 a year.

单项选择题