They asked him to tell them everything ________ he saw at the front.
A. what B. that C. which D. where
My uncle’s house in the downtown area is much smaller than ours, but it is twice _______ expensive.
A. as B. so C. too D. very
The other day, my brother drove his car down the street at ________ I thought was a dangerous speed.
A. as B. which C. what D. that
The street is beautiful, for there are trees on ________.
A. neither side B. either side
C. both side D. all sides
完形填空，阅读下面短文，从短文后各题所给的四个选项（A、B、C和D）中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
In 1930, a young African American, Vivien T. Thomas, a professional carpenter, was hired as a lab assistant by a famous white doctor named Dr. Alfred Blalock. Although he _________went to college, he had an enormous _________to learn and explore the power of knowledge. Whenever Dr. Blalock left his office, young Thomas used to _________ study the medical books on the shelves of the office.
Thomas _________ a great interest in learning more and more about _________ when he started to assist Blalock during his practice of surgeries on dogs. _________ Dr. Blalock understood Thomas’s ability to help him perform a complicated surgery; he still did not _________ Thomas as a smart person because of the social _________ of prejudice towards African Americans.
Dr. Blalock wanted to _________ to believe that Thomas was just a (n) _________ by profession and a lab assistant. Employees, white or black, at the hospital could not _________ that an African American, Thomas, could run the lab. He was the _________ and thus a history maker.
In those days, the society expected that black people were _________to be janitors (管理员). Despite this reality, Thomas’ cleverness, perseverance, and passion had _________ a need in Dr. Blalock’s mind. Thomas ran John Hopkins Hospital’s surgical (外科的) lab _________ Dr. Blalock. At the time, all other _________ employees in the hospital were janitors. Dr. Blalock and Thomas became a _________ and conducted a joint research that _________ the first heart surgery performed at John Hopkins University Hospital in 1941.
Many years later, Thomas’s contribution was _________ and he was eventually awarded an honorary doctorate, for his creative work in the _________ procedures of modern cardiac(心脏病的) surgery. As he became Dr. Thomas, he also inspired and lifted the confidence of the future generation. He used his knowledge for the betterment of humankind.
1.A. alwaysB. oftenC. occasionallyD. never
2.A. chanceB. desireC. incomeD. success
3.A. secretlyB. publiclyC. nervouslyD. proudly
4.A. discoveredB. avoidedC. developedD. protected
5.A. literatureB. medicineC. politicsD. history
6.A. WhileB. WhenC. AsD. Because
7.A. praiseB. rewardC. criticizeD. accept
8.A. benefitB. positionC. pressureD. revolution
9.A. agreeB. continueC. regretD. remember
10.A. carpenterB. professorC. engineerD. scientist
11.A. promiseB. argueC. explainD. understand
12.A. nextB. lastC. firstD. same
13.A. hardlyB. merelyC. luckilyD. mostly
14.A. createdB. searchedC. builtD. missed
15.A. overB. aboveC. withoutD. under
16.A. commonB. nobleC. blackD. poor
17.A. unitB. teamC. familyD. system
18.A. led toB. resulted from
C. accounted forD. gave up
19.A. changedB. followedC. exhibitedD. recognized
20.A. pioneeringB. surprisingC. interestingD. worrying
Scientists have devised a way to determine roughly where a person has lived using a strand (缕) of hair, a technique that could help track the movements of criminal suspects or unidentified murder victims.
The method relies on measuring how chemical variations in drinking water show up in people’s hair.
“You’re what you eat and drink, and that’s recorded in your hair,” said Thure Cerling, a geologist at the University of Utah.
While U.S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move.
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes (同位素). The heaviest rain falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of rain systems.
“It’s not good for pinpointing(精确定位),” Cerling said. “It’s good for eliminating many possibilities.”
Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.
The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.
When Park heard about the research, he gave the hair samples to the researchers.
Chemical testing showed that over the two years before her death, she moved about every two months.
She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.
“It’s still a substantial area,” Park said “But it narrows it way down for me.”
1.What is the scientists’ new discovery?
A. One’s hair growth has to do with the amount of water they drink.
B. A person’s hair may reveal where they have lived.
C. Hair analysis accurately identifies criminal suspects.
D. The chemical composition of hair varies from person to person.
2.What does the author mean by “You’re what you eat and drink” (Line 1, Para.3)?
A. Food and drink affect one’s personality development.
B. Food and drink preferences vary with individuals.
C. Food and drink leave traces in one’s body tissues.
D. Food and drink are essential to one’s existence.
3.What did Cerling’s team produce in their research?
A. A map showing the regional differences of tap water.
B. A collection of hair samples from various barber shops.
C. A method to measure the amount of water in human hair.
D. A chart illustrating the movement of the rain system.
4.What is the practical value of Cerling’s research?
A. It helps analyze the quality of water in different regions.
B. It helps the police determine where a crime is committed.
C. It helps the police narrow down possibilities in detective work.
D. It helps identify the drinking habits of the person under investigation.
