证明某溶液中只含Fe2+而不含有Fe3+的实验方法是( ) A.先加氯水,再滴加KSCN溶液后显红色 B.先滴加KSCN溶液,不显红色,再滴加氯水后显血红色 C.滴加NaOH溶液,产生红褐色沉淀 D.只需要滴加KSCN溶液 答案:B2、 Advertising actually has a dual(双重的)function:to sell,as
well as to inform.If you stop to think of it,advertisements(ads)provide information of almost everything in our
household and immediate environment,from shampoo to
fuel for cars.An obvious purpose is to inform consumers
of new products and services as well as to remind them of established ones.Performance,price,value
for money,quality and reliability are some of the main
features mentioned in ads.
Yet there is
another important side of advertising that should not be forgotten:choice.A
number of ads for different brands of the same product,e.g.toothpaste,shampoo
or washing powder allow the consumer to choose.Choice
is an important part of buying.
In this busy
day and age,there is
little time for comparison shopping.To determine which
product is the best to buy,and at the most competitive
price,consumers these days rely on advertising in its
various forms.This saves time and energy and makes
shopping easier.
Few can deny
that ads benefit the consumer since they encourage healthy competition.When companies compete for the
consumer’s dollar,this is good
for the purchaser of the product or service.Advertising
tends to increase competition since it informs consumers of what is available.One company’s offer will be either matched
or bettered by another company in its advertising.
It was unheard
of ten years ago to buy products directly using a personal computer,but it has become a matter of course
for some people to browse(浏览)the Internet,surf until they find an e commerce site and then select the
product.Marketing products has been almost turned
upside down by new ways of selling and buying.More than
at any time in history,the choice of goods is unlimited.The whole world is a customer’s marketplace.For busy people like you and me,advertisements
actually do us a favor.
41.What the writer of this passage wants to tell us most
is that―――――――――.
A.advertisements benefit busy people
in many ways
B
advertisements encourage more business competitions
C
advertisements provide main features of new products
D selling
and informing are two functions of advertising
42.Which is least discussed in the
passage as, one of the important sides of advertising?
A.To inform consumers of new products
and services.
B To
provide consumers with chances to choose.
C To
increase healthy competition of companies.
D To
change the way of selling and buying.
43.The “comparison
shopping” refers to the behavior of
.
A.comparing and buying a product at
the lowest price
B.comparing and deciding which is the
best to buy
C.relying on advertising and
simplifying shopping
D.buying a product at the least
competitive price
44.Healthy competition benefits
consumers because―――――――――.
A it
helps companies to compete for the market
B.it gets companies to improve their
services
C.it provides them with the best
products and services
D.it gives them many chances to choose
their products