[单项选择]Roots have the ability to （）
A. make proteins
B. obtain fresh air
C. produce inorganic nitrogen
D. carry out activities without energy

[单项选择]Some people apparently have an amazing ability to ______ the right answer.
A. come up with
B. look up to
C. put up with
D. clear up

[单项选择]According to the passage, people have the ability to recognize others by ______.
A. their hands
B. their names
C. their voices
D. their faces

[单项选择]We have a firm belief in our ability to overcome the obstacles which__________ us.
A. formulate
B. orientate
C. confront
D. saturate

[单项选择]The scientists found what the isolated roots need is （）
A. quite natural
B. sugar, minerals and vitamins
C. some rare vitamins
D. organic nitrogen compounds

[单项选择]

Liquorice Consists of the dried,unpeded roots and stolns,and contains not less than 4．0% of glycyrrhizinic acid．Which of the following is true（）

A. 除去外皮的根
B. 除去外皮的根茎
C. 潮湿的根茎
D. 不少于4．0%的甘草酸
E. 低于4．0%的甘草酸

[单项选择]The roots of the plant transmit the moisture and _________ to the trunk and branch.
A. nutritive
B. nutrients
C. nutritious
D. nutrition

[单项选择]Roots of plants tend to grow downward into soil, unless-----more readily available at the surface.
A. have water
B. water has
C. is water
D. water is

[单项选择]While the roots of social psychology (lie in) the intellectual soil of the whole Western tradition, (it's) present (flowering) is recognized to be (characteristically) an American phenomenon.

[单项选择]It was necessary to（　）the movie" Roots" into five parts in order to show it on television.
A. adapt
B. abridge
C. segment
D. transact

[单项选择]Plants with roots appeared about ______ million years ago.
A. 430
B. 300
C. 330
D. 100

[单项选择]

St. Valentine’s Day, has roots in several different legends. One of the earliest popular symbols of the day is Cupid, the Roman god of love, who has the image of a young boy with bow and arrow.
Three hundred years after the death of Jesus Christ, the Roman emperors still demanded that everyone believe in the Roman gods. Valentine, a Christian priest, had been thrown in prison for his teachings. He supposedly cured the jailer’s daughter of her blindness. The night before he was executed on February 14, he wrote the jailer’s daughter a farewell letter, signing it "From Your Valentine".
Another Valentine was an Italian bishop (主教) who lived at about the same time, AD 200. He was imprisoned because he secretly married couples, contrary to the laws of the Roman emperor. Some legends say he was burned to death.
February 14 was also a Roman holiday, held in honor of a goddess. The custom of choosing a sweetheart on this date sp
A. It introduces the origins of St. Valentine's Day and the holiday in the past.
B. It tells us various kinds of legends about people who have the same name of St. Valentine.
C. It mainly explains how the name of St. Valentine's Day comes.
D. It helps people know the roots of St. Valentine's Day and its development and habits nowadays.