Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
The first two decades of this century were dominated by the microbe hunters. These hunters had tracked down one after another of the microbes responsible for the most dreaded scourges of many centuries: tuberculosis, cholera, diphtheria. But there remained some terrible diseases for which no microbe could be incriminated: scurvy, pellagra, rickets, beriberi. Then it was discovered that these diseases were caused by the lack of vitamins, a trace substance in the diet. The diseases could be prevented or cured by consuming foods that contained the vitamins. And so in the decades of the 1920's and 1930's, nutrition became a science and the vitamin hunters replaced the microbe hunters.
In the 1940's and 1950's, biochemists strived to learn why each of the vitamins was essential for health. They discovered that key enzymes in metabolism depend on one or another of the vitamins as coenzymes to perform the chemistry that provides cells with energy for growth and function. Now, these enzyme hunters occupied center stage.
You are aware that the enzyme hunters have been replaced by a new breed of hunters who are tracking genes - the blueprints for each of the enzymes - and are discovering the defective genes that cause inherited diseases - diabetes, cystic fibrosis. These gene hunters, or genetic engineers, use recombinant DNA technology to identify and clone genes and introduce them into bacterial cells and plants to create factories for the massive production of hormones and vaccines for medicine and for better crops for agriculture. Biotechnology has become a multibilliondollar industry.
In view of the inexorable progress in science, we can expect that the gene hunters will be replaced in the spotlight. When and by whom? Which kind of hunter will dominate the scene in the last decade of our waning century and in the early decades of the next? I wonder whether the hunters who will occupy the spotlight will be neurobiologists who apply the techniques of the enzyme and gene hunters to the funtions of the brain. What to call them? The head hunters. I will return to them later.
Question:How do vitamins influence health?
A. They protect the body from microbes
B. They are broken down by cells to produce energy
C. They keep food from spoiling
D. They are necessary for some enzymes to function
Đáp án D
Kiến thức: Đọc hiểu
Giải thích:
Vitamin ảnh hưởng đến sức khoẻ như thế nào?
A. Chúng bảo vệ cơ thể khỏi vi khuẩn
B. Chúng được chia nhỏ bởi các tế bào để sinh ra năng lượng
C. Chúng giữ thức ăn không bị hư hỏng
D. Chúng cần thiết để một số enzyme hoạt động
Thông tin: They discovered that key enzymes in metabolism depend on one or another of the vitamins as coenzymes to perform the chemistry that provides cells with energy for growth and function.
Gói VIP thi online tại VietJack (chỉ 400k/1 năm học), luyện tập gần 1 triệu câu hỏi có đáp án chi tiết
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
You may note down your qualifications and experience that can relate to the job.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
She has made an ______ for the job as a nursery teacher because she likes children.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
There was hardly_______ money left in the bank account.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Mary hardly ever cooks, ______?
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Who was the first person ______ the South Pole?
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
In order to avoid to make mistakes, take your time and work carefully.
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word(s) in each of the following questions.
Many large corporations will be wiped out and millions of jobs will be lost.
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
Terry______ in three movies already. I think he’ll be a star some day.
Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.
On the whole, the rescue mission was well executed.
Mark the letter A, B, C or D on your answer sheet to indicate the sentence which has the same meaning as the original one.
They bought a gift that was very expensive for their son.
Mark the letter A, B, c or D on your answer sheet to indicate the sentence which best combines each pair of sentences in the following questions.
I owed Bill a favor. I agreed to help him.
Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.
Sara: "How do you feel about his comment?"
- Mary: “______.”
Mark the letter A, B, C or D on your answer sheet to indicate the sentence which has the same meaning as the original one.
He wants his wife to quit her job and look after their children.
Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.
Most of the early houses built in America were suited to farm life, as it was not until cities became manufacturing centers that colonists could survive without farming as their major occupation. Among the earliest farmhouses in America were those built in Plymouth Colony. Generally they consisted of one large rectangular room on the ground floor, called a hall or great room and having a fireplace built into one of the walls, and a loft overhead. Sometimes a lean-to was attached alongside the house to store objects such as spinning wheels, firewood, barrels, and tubs. The furnishings in the great room were sparse and crudely built. Tabletops and chest boards were split or roughly sawed and often smoothed only on one side. Benches took the place of chairs, and the table usually had a trestle base so it could be dismantled when extra space was required. One or two beds and a six-board chest were located in one corner of the room. The fireplace was used for heat and light, and a bench often placed nearby for children and elders, in the area called the inglenook.
The original houses in Plymouth Colony were erected within a tall fence for fortification. However, by 1630 Plymouth Colony had 250 inhabitants, most living outside the enclosure. By 1640, settlements had been built some distance from the original site. Villages began to emerge throughout Massachusetts and farmhouses were less crudely built. Windows brought light into homes and the furnishings and décor were more sophisticated.
As more diversified groups of immigrants settled the country, a greater variety of farmhouses appeared, from Swedish long-style houses in the Delaware Valley to saltbox houses in Connecticut, Dutch-Flemish stone farmhouses in New York, and clapboard farmhouses in Pennsylvania. From Georgian characteristics to Greek revival elements, farmhouses of varied architectural styles and building functions populated the landscape of the new frontier.
Question:The word "it" in paragraph 1 refers to
Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.
The government devalued the currency to try to revive the ______ economy.