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.
Many ants forage across the countryside in large numbers and undertake mass migrations; these activities proceed because one ant lays a trail on the ground for the others to follow. As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger on the ground and depositing a tiny amount of trail pheromone-a mixture of chemicals that delivers diverse messages as the context changes. These trails incorporate no directional information and may be followed by other ants in either direction.
Unlike some other messages, such as the one arising from a dead ant, a food trail has to be kept secret from members of other species. It is not surprising then that ant species use a wide variety of compounds as trail pheromones. Ants can be extremely sensitive to these signals. Investigators working with the trail pheromone of the leafcutter ant Attatexana calculated that one milligram of this substance would suffice to lead a column of ants three times around Earth.
The vapor of the evaporating pheromone over the trail guides an ant along the way, and the ant detects this signal with receptors in its antennae. A trail pheromone will evaporate to furnish the highest concentration of vapor right over the trail, in what is called a vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna onto the vapor space. In following the trail, the ant moves to the right and left, oscillating from side to side across the line of the trail itself, bringing first one and then the other antenna into the vapor space. As the ant moves to the right, its left antenna arrives in the vapor space.The signal it receives causes it to swing to the left, and the ant then pursues this new course until its right antenna reaches the vapor space. It then swings back to the right, and so weaves back and forth down the trail
The word “intermittently” in the passage is closest in meaning to _______.
A. lazily
B. happily
C. periodically
D. incorrectly
Giải bởi qa.haylamdo.com
Chọn C
Kiến thức: Đọc hiểu
Giải thích:
Từ “intermittently” trong bài đọc gần nghĩa nhất với_______.
A. lười biếng
B. vui vẻ
C. một cách tuần hoàn, liên tục
D. không chính xác
Thông tin: As a worker ant returns home after finding a source of food, it marks the route by intermittently touching its stinger on the ground and depositing a tiny amount of trail pheromone-a mixture of chemicals that delivers diverse messages as the context changes.
Tạm dịch: Khi một con kiến thợ trở về tổ sau khi tìm được nguồn thức ăn, nó đánh dấu đường bằng cách liên tục chạm vào cái vòi của nó vào mặt đất và để lại một lượng nhỏ pheromone dẫn đường - một hợp chất mang nhiều lời nhắn khác nhau tùy vào từng tình huống
The captain has not decided yet where to stop on the journey – we’ll just play it by_______ and see how we feel
What is most striking is that most authors made_______ efforts to secure proper authorization for their works
Two school boys are talking to each other.
Harry: “Were you chosen for our school football team?
Porter: “_______”
Amazon.com, Inc, is an America multinational technology company based in_______ Seattle, Washington that focuses on_______ e- commerce, cloud computing, and artificial intelligence
We’ve had a burglar alarm installed in our holiday cottage _______we will feel happier about leaving it unoccupied for long periods
The committee, in an earlier report, was accused of sweeping financial problems under the carpet to avoid embarrassment
_______, the would-be thief made quite a commotion, which alerted the soldiers who then arrested the man
Choose the word or phrase OPPOSITE in meaning to the underlined part in each of the following sentences
Work efficiency has increased appreciably each year thanks to computers and their ability to multitask
Ants were the first group of eusocial predatory insects (A) that both (B) lived and foraged primarily (C) in the soil and in rotting vegetation (D) on the ground
The receptionist didn’t know_______ whom the message was intended
Once_______ with the latest technology, many vehicle manufacturing factories are believed to reduce emissions of nitrogen oxides (NOx) drastically
“Who volunteered to pick up the refreshments for today’s meeting?” – “ ________”
There are two major factors_______ this decrease in the number of students_______ an MBA degree in their countries today
Many students regret not having taken the opportunity to learn English when they were at high school
