Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.
A. do sound waves
B. than sound waves are
C. than sound waves do
D. sound waves
Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder
A. do sound waves
B. than sound waves are
C. than sound waves do
D. sound waves
Chọn C
Câu đề bài: “Mặc dù sấm và sét được tạo ra cùng một lúc, sóng ánh sáng đi xa hơn___________, vì vậy chúng ta thấy sét trước khi chúng ta nghe thấy sấm ".
Đáp án C: than sound waves do
—» Đây là cách nói rút gọn của “than sound waves travel”: cấu trúc so sánh hơn kém:
S + V + trạng từ ngắn đuôi er/dài thêm more + than + S + V.
* Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Although thunder and lightning are produced at the same time, light waves travel faster________, so we see the lightning before we hear the thunder.
A. do sound waves
B. than sound waves are
C. than sound waves do
D. sound waves
Chọn C Câu đề bài: “Mặc dù sấm và sét được tạo ra cùng một lúc, sóng ánh sáng đi xa hơn___________, vì vậy chúng ta thấy sét trước khi chúng ta nghe thấy sấm ".
Đáp án C: than sound waves do
—» Đây là cách nói rút gọn của “than sound waves travel”: cấu trúc so sánh hơn kém:
S + V + trạng từ ngắn đuôi er/dài thêm more + than + S + V.
Although thunder and lightning are produced at the same time, light waves travel faster _______, so we see the lightening before we hear the thunder
A. than sound waves do
B. than sound waves are
C. do sound waves
D. sound waves
Đáp án A So sánh hơn của trạng từ ngắn (fast): S + V + adv-er + than + S + do/does
Mark the letter A, B, C or D to indicate the correct answer to each of the following questions.
Question 8: Although thunder and lightning are produced at the same time, light waves travel faster _____, so we see the lightening before we hear the thunder.
A. than sound waves do
B. than sound waves are
C. do sound waves
D. sound waves
Đáp án A
Giải thích: Khi so sánh, vế sau than phải dùng đúng cấu trúc như về trước (ví dụ He drives faster than I drive/ He is taller than I am), tuy nhiên có thể tránh lặp bằng cách thay động từ bằng trợ động từ tương ứng, to be thì giữ nguyên.
Dịch nghĩa: Mặc dù sấm và chớp được tạo ra cùng một lúc, nhưng sóng ánh sáng đi nhanh hơn sóng âm thanh nên ta nhìn thấy chớp trước khi nghe thấy sấm.
Although thunder and lightening are produced at the same time, light waves travel faster _____, so we see the lightening before we hear thunder.
A. the same as sound waves
B. than sound waves are
C. than sound waves seem
D. than do sound waves
Đáp án: D
Cấu trúc so sánh hơn với trạng từ ngắn: S1+ V+ adv_er+ than+ S2. “do sound waves” là đảo ngữ của câu so sánh cho: trợ động từ len trước danh từ.
The weather is not beautiful all of the time. Perhaps you can remember a day when bad weather made you afraid. One kind of bad weather that scares many people is called a thunderstorm. This is what happens when there is a thunderstorm. First, you see a sudden flash of bright light. A few seconds later you hear a loud rumbling sound. This quick flash is called lightning and the loud sound is called thunder. Lightning is colorful , but it can cause serious problems. Lightning is electricity that is moving very rapidly. It may be moving between a cloud and the ground, between two clouds, or between two parts of the same cloud. The lightning heats the air around it. This hot air expands, or get bigger, and it causes the air to move in waves. The air waves pass you in a series, one after another. For this reason, you may hear many rumbles and not just one sound.
____ 29/ Lightning may move between a cloud and the ground.
____ 30/ Thunder is a very bright light in a thunderstorm.
____ 31/ When you hear thunder you may hear a series of loud sounds and not one
big sound. This is because the air waves pass one after another.
____ 32/ Lightning always moves rapidly.
The weather is not beautiful all of the time. Perhaps you can remember a day when bad weather made you afraid. One kind of bad weather that scares many people is called a thunderstorm. This is what happens when there is a thunderstorm. First, you see a sudden flash of bright light. A few seconds later you hear a loud rumbling sound. This quick flash is called lightning and the loud sound is called thunder. Lightning is colorful , but it can cause serious problems. Lightning is electricity that is moving very rapidly. It may be moving between a cloud and the ground, between two clouds, or between two parts of the same cloud. The lightning heats the air around it. This hot air expands, or get bigger, and it causes the air to move in waves. The air waves pass you in a series, one after another. For this reason, you may hear many rumbles and not just one sound.
__T__ 29/ Lightning may move between a cloud and the ground.
__F__ 30/ Thunder is a very bright light in a thunderstorm.
__T__ 31/ When you hear thunder you may hear a series of loud sounds and not one
big sound. This is because the air waves pass one after another.
__T__ 32/ Lightning always moves rapidly.
In a big storm, why do you hear the thunder after you have seen the lightning?
A. The speed of sound is greater than the speed of light
B. Our eyes respond quicker than our ears
C. Thunder happened at some time after the lightning
D. The speed of sound is much slower than the speed of light
A vacuum will neither conduct heat nor ...
A. transmit sound waves B. transmitting sound waves
C. sound waves are transmitted D. the transmission of sound waves
A vacuum will neither conduct heat nor ...
A. transmit sound waves B. transmitting sound waves
C. sound waves are transmitted D. the transmission of sound waves
Read the passage and choose the best answer.
A pilot cannot fly by sight alone. In many conditions, such as flying at night and landing in dense fog, a pilot must use radar, an alternative way of navigating. Since human eyes are not very good at determining speeds of approaching objects, radar can show a pilot how fast nearby planes are moving. The basic principle of radar is exemplified by what happens when one shouts in a cave. The echo of the sounds against the walls helps a person determine the size of the cave. With radar, however, the waves are radio waves instead of sound waves. Radio waves travel at the speed of light, about 300,000 kilometers in one second. A radar set sends out a short burst of radio waves. Then it receives the echoes produced when the waves bounce off objects. By determining the time it takes for the echoes to return to the radar set, a trained technician can determine the distance between the radar set and other objects. The word “radar”, in fact, gets its name from the term “radio detection and ranging”. “Ranging” is the term for detection of the distance between an object and the radar set. Besides being of critical importance to pilots, radar is essential for air traffic control, tracking ships at sea, and for tracking weather systems and storms.
Which type of waves does radar use?
A. tidal
B. sound
C. heat
D. radio
Dựa vào “With radar, however, the waves are radio waves instead of sound waves.”
Đáp án D