问题 选择题

上个世纪80年代,科学家通过研制发现了一种新分子,这种新分子具有空心的类似足球状的结构,其化学式是C60.有关C60的下列说法中正确的是(  )

A.C60中可能含有离子键

B.C60中的化学键只有共价键

C.C60是一种新型的化合物

D.C60和金刚石互为同位素

答案

A、C60中碳元素是非金属元素,所以只含共价键不含离子键,故A错误.

B、C60中碳元素是非金属元素,所以只含共价键不含离子键,故B正确.

C、C60是由一种元素组成的纯净物,所以是单质不是化合物,故C错误.

D、C60和金刚石是碳元素的不同单质,所以是同素异形体不是同位素,故D错误.

故选B.

阅读理解

阅读理解。

     Le Whif, an inhaler (吸入剂) that allows chocolate lovers to meet their needs whenever they please

without putting on weight, is to be released in British stores. The invention, called the world's first breathable

food by its creators, lets consumers suck in the taste of chocolate or coffee while taking on less than one

calorie. Its makers claim it will enable dieters to enjoy their favorite snacks without worrying about their

waistline.

     The lipstick-style tube contains hundreds of milligrams of tiny food particles which are small enough to

become conveyed by air, but too large to enter the lungs. Each Le Whif contains enough flavor for about

eight to ten whiffs (喷射) and costs 1.99 on its own, or £4.99 for a pack of three. The inhaler is available

in chocolate, raspberry chocolate and mint chocolate models as well as coffee flavor, which gives a dose of

caffeine equivalent to a small short of strong black coffee.

     It was invented by Prof. David Edwards. He said Le Whif was not designed to replace food but could be

used to increase dining experiences, such as allowing people to sample a variety of dishes from restaurant

menus before ordering their meal.

     He said, "In terms of living off whiffing we aren't even close to being there. But there clearly has been a

revolution over the last few years where we are eating smaller amounts of food more frequently and choosing

food or its aesthetic (审美的) pleasure. We will be launching new whiffing experiences probably every six

months. It is reasonable to assume that the next line of whiffing products will be even more health centered."

     The product was released in Paris in 2009 and the initial production run of 25,000 inhalers were sold out

within a month. It has since been made available across France and in the US. In Britain Le Whif is to be sold

firstly in House of Fraser for a month, after which it could become more widely distributed.

1. According to Paragraph 1, Le Whif ____.

A. is a new kind of healthy food

B. contains few nutrients in fact

C. is popular with British chocolate lovers

D. is able to help dieters lose weight

2. What's the main purpose of inventing Le Whif?

A. To produce all kinds of chocolate.

B. To replace the traditional chocolate.

C. To change the coffee flavor.

D. To increase people's dining experiences.

3. Which of the following statements does David Edwards agree with?

A. His new products will come out once a year.

B. Le Whif is a revolution that will change people's life.

C. The whiffing products in the future will be improved.

D. Le Whif can make people eat less food.

4. From the passage, we know that ____.

A. customers can buy Le Whif all over the world

B. I.e Whif hasn't been made available in British stores

C. Ie Whif contains hundreds of tiny food particles which are small enough to enter the lungs

D. Le Whif can help to lose weight but is harmful to health

单项选择题