小明利用电能表测某家用电器的电功率，当电路中只有这个用电器工_爱下问搜题

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问题选择题

小明利用电能表测某家用电器的电功率，当电路中只有这个用电器工作时，测得在20min内，消耗电能0.3kW•h，这个用电器可能是（　　）

A．微波炉

B．电风扇

C．电视机

D．收音机

答案

由P=

W

t

得：P=

0.3KW•h

20

60

h

=0.9kW；

以上四种家用电器中功率接近900W的只有微波炉．

故选A．

阅读理解

阅读理解。

( )1. Lanlan is a lovely and kind
girl. She hopes that she can help
the children who lose chances
to go to school.
( )2. Liu Hong is going back to
her home town for the summer
vacation. She will buy a camera.
She will take some photos and
show them to her classmates
when she returns.
( )3. Mr. and Mrs. Smith want
to have a relaxing holiday out of
the busy city. They like to stay-
in a classical (古典的) building.
( )4. Jim is very interested in
pandas but he knows little about
them. He wants to borrow some
books on pandas.
( )5. Mr. Lu will pay 60 yuan
to see an American movie with
his son.

A. Wickets Hotel
     A 200-year-old country house in the country south to the city
of Rome with 30 bedrooms. Three meals provided a day. Open
all year round.
B. City Library
     The largest library in the area with over 70 000 books of
different kinds in it. Two big reading-rooms which can hold
2 000 readers. Open from 9:00 am to 7:00 pm, Monday to
Saturday.
C. Sunny Museum
     An art show from August 1st to 20th. Over 300 paintings
by world famous artists will be shown in it.
D. Concert
     A concert in Jinma Theater on July 10th. Some famous
singers in China will sing in the concert. The money for the
tickets will, be used for the poor children.
E. Singing Competition
     The House of Culture of the city will hold a singing competition
in October. Those who like singing can take part in the competition.
F. Dadi Cinema
     "Snow White", a cartoon by Disney, will be shown in Dadi
Cinema next Sunday. Ticket Price. ￥40. (Half for children)
G. Canon Digital (数码) Camera
     A Canon digital camera with 8 million pels (象素) is on sale for
2 500 yuan in Tianhe Supermarket in Guangzhou.

单项选择题

疾病发生的三角模型存在的缺陷是（）。

A.强调病原物

B.强调环境

C.强调宿主

D.强调遗传因素

E.强调病原物、宿主和环境同等重要