问题 名词解释

渗透压

答案

参考答案:

是某水溶液中一个可用压力来量度的物化指标。它表示两种不同浓度的溶液间若被一个半透性薄膜隔开时,稀溶液中的水分子会因水势的推动而透过薄膜流向浓溶液,直至浓溶液所产生的机械压力足以使两边水分子的进出达到平衡为止,这时由浓溶液中的溶质所产生的机械压力,既为它的渗透压值。

阅读理解

In every little girl’s toy box. there might be a Barbie Doll. Barbie is 50 years old this, year. It was designed(设计)in 1959 by an American businesswoman named Ruth Handler. She and her husband Elliott started the toy company Mattel. She named the new doll after their daughter Barbara. The first Barbie Doll appeared at the toy fair(交易会)New York on March 9th, 1959. This date is used as Barbie’s birthday.

Mattel sold three hundred thousand Barbie Dolls in the first year at a price of three dollars. Today, a fifty-year-old Barbie in good condition might cost more than twenty-seven thousand dollars. Mattel says 90% of the girls in the United States aged from three to ten own at least one Barbie Doll. And girls aged three to six own an average(平均)of about twelve.

When Mattel created Barbie Dolls half a century ago, they never thought this doll would become a legend. Now Barbie Dolls are famous all over the world. They are sold in one hundred and fifty countries, and every second three Barbie Dolls are sold around the world.

小题1:Who designed the first Barbie Doll in 1959?

A.Mattel.

B.Elliott.

C.Barbara.

D.Ruth Handler.小题2:A Barbie D011 cost _______dollars in the first year after it appeared.

A.3

B.50

C.90

D.27,000小题3:What does the underlined word “legend” mean in the passage?

A.传播

B.传奇

C.传承

D.传达小题4:The writer doesn’t tell us _______.

A.Barbie Dolls are very popular with girls

B.Barbie Dolls sell well around the world

C.what the first Barbie Doll was based on

D.the doll Barbie was named after Barbara小题5:What’s the best title of the passage? ______.

A.Barbie’s birthday

B.Barbie Dolls

C.A lovely girl named Barbie

D.Why are Barbies popular

单项选择题 A1/A2型题