Câu hỏi:
12/07/2024 1,582
Read the passage and choose the best heading in the box for each paragraph. There are three extra ones that should not be used.
A. How to maximize the SPF of suncreens
B. Summer sport and skin protection
C. How the various types of radiation differ?
D. Sunscreens: the higher the SPF the better?
E. What is ultraviolet radiation?
F. Other ways to protect yourself
G. What are the first signs of skin cancer?
H. A short break in the sun won’t hurt, will it?
1.___________
Sunshine contains three different bans of ultraviolet radiation: UVA, UVB and UVC. Although UVC is the most dangerous, because it is a shorter-wavelength radiation than UVA and UVB, it is screened out by the Earth’s ozone layer. UVA used to be thought less dangerous than UVB, but it is now known that both bands can cause skin cancer. It is UVB which causes sunburn. However, both UVA and UVB can age the skin prematurely.
Read the passage and choose the best heading in the box for each paragraph. There are three extra ones that should not be used.
A. How to maximize the SPF of suncreens
B. Summer sport and skin protection
C. How the various types of radiation differ?
D. Sunscreens: the higher the SPF the better?
E. What is ultraviolet radiation?
F. Other ways to protect yourself
G. What are the first signs of skin cancer?
H. A short break in the sun won’t hurt, will it?
1.___________
Sunshine contains three different bans of ultraviolet radiation: UVA, UVB and UVC. Although UVC is the most dangerous, because it is a shorter-wavelength radiation than UVA and UVB, it is screened out by the Earth’s ozone layer. UVA used to be thought less dangerous than UVB, but it is now known that both bands can cause skin cancer. It is UVB which causes sunburn. However, both UVA and UVB can age the skin prematurely.
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Trả lời:
Giải bởi Vietjack
Chọn C
How the various types of radiation differ?
Câu hỏi cùng đoạn
Câu 2:
2.___________
Levels of UV rays can vary. A two-week holiday in the Mediterranean will expose you to the same amount of sun as you would get in a year in Britain. Short periods of intense exposure to the sun are thought to be more risky than regular daily exposure, particularly if you have fairer skin. However, even if you have darker skin tones you will burn eventually. You can find out the daily UV rate by watching the solar UV index which has recently been introduced on national weather forecasts across Europe.
2.___________
Levels of UV rays can vary. A two-week holiday in the Mediterranean will expose you to the same amount of sun as you would get in a year in Britain. Short periods of intense exposure to the sun are thought to be more risky than regular daily exposure, particularly if you have fairer skin. However, even if you have darker skin tones you will burn eventually. You can find out the daily UV rate by watching the solar UV index which has recently been introduced on national weather forecasts across Europe.
Lời giải của GV VietJack
Chọn H
A short break in the sun won’t hurt, will it?
Câu 3:
3.___________
The ideal sunscreen to use is an SPF15. This means a sunscreen which gives you fifteen times more protection that you would have normally. An SPF15 sunscreen will absorb proportionally equal amounts of UVA and UVB, and will give you good protection if you are sensible about your exposure. Sunscreens higher than SPF15 tend to lose their balanced effect: the chemicals in an SPF30, for example, will not block UVA rays as effectively as UVB. The other danger with high SPFs is that people will stay in the sun longer because they think are better protected. Higher SPFs do not give proportionately greater protection. An SPF15 gives 93 percent protection, for example, while an SPF34 gives 97 percent protection.
3.___________
The ideal sunscreen to use is an SPF15. This means a sunscreen which gives you fifteen times more protection that you would have normally. An SPF15 sunscreen will absorb proportionally equal amounts of UVA and UVB, and will give you good protection if you are sensible about your exposure. Sunscreens higher than SPF15 tend to lose their balanced effect: the chemicals in an SPF30, for example, will not block UVA rays as effectively as UVB. The other danger with high SPFs is that people will stay in the sun longer because they think are better protected. Higher SPFs do not give proportionately greater protection. An SPF15 gives 93 percent protection, for example, while an SPF34 gives 97 percent protection.
Lời giải của GV VietJack
Chọn D
D. Sunscreens: the higher the SPF the better?
Câu 4:
4.____________
Only UVA rays can pass through glass, so you won’t get sunburnt sitting by a window, while you can still enjoy the warmth of the sun. Be careful when sitting in the shade, however. You can still get burnt because you will be exposed to rays bouncing off reflective surfaces nearby. This is particularly the case near water. Not all clothing offers effective protection, either. If you can see the light through a piece of clothing when you hold it up, it will not offer much of a barrier to UV rays.
4.____________
Only UVA rays can pass through glass, so you won’t get sunburnt sitting by a window, while you can still enjoy the warmth of the sun. Be careful when sitting in the shade, however. You can still get burnt because you will be exposed to rays bouncing off reflective surfaces nearby. This is particularly the case near water. Not all clothing offers effective protection, either. If you can see the light through a piece of clothing when you hold it up, it will not offer much of a barrier to UV rays.
Lời giải của GV VietJack
Chọn F
F. Other ways to protect yourself
Câu 5:
5.____________
You should keep an eye out for any moles or dark spots on the skin that change in size, shape, or color, become bigger, itchy or inflamed, or bleed. All these may be symptoms of skin cancer and should be checked by a doctor. Once a mole has been identified as a potential melanoma, it is removed under local anaesthetic and sent for examination. Most turn out to be harmless. Of the three forms of skin cancer the two most common varieties – basal cell and squamous cell carcinomas are easily treatable and rarely fatal, and even melanomas can be treated effectively if caught in time.
5.____________
You should keep an eye out for any moles or dark spots on the skin that change in size, shape, or color, become bigger, itchy or inflamed, or bleed. All these may be symptoms of skin cancer and should be checked by a doctor. Once a mole has been identified as a potential melanoma, it is removed under local anaesthetic and sent for examination. Most turn out to be harmless. Of the three forms of skin cancer the two most common varieties – basal cell and squamous cell carcinomas are easily treatable and rarely fatal, and even melanomas can be treated effectively if caught in time.
Lời giải của GV VietJack
Chọn G
G. What are the first signs of skin cancer?
Nhà sách VIETJACK:
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