搜索
What would you do if you had trouble seeing clearly? You would probably go to an eye doctor who might give you glasses. For many people around the world, however, such a way isn’t that simple.
The World Health Organization reports that glasses can help one billion people in the world. Yet places like Ghana have only one eye doctor every 8 million people. This makes glasses almost impossible to get. Joshua Silver, a teacher at Oxford University, however, may have solved the problem.
Mr. Silver has developed liquid(液体)—filled glasses that users can adjust(调整) by themselves without seeing a doctor! The lenses(镜片) are filled with oil. Using a dial on the glasses, the user changes the amount of oil. This changes the strength(度数) of the lens. After the user finds the right strength, he then fixes the lens.
Results show that among those who have tried the glasses, around 80% are satisfied. Mr. Silver’s goal is for everyone who still needs glasses to have such glasses as soon as possible. With a little more effort, Mr. Silver thinks that his goal might be achieved in the near future.
1．The underlined word “this” in the second paragraph(段落) means _______.| A．glasses can help many people | B．Mr. Silver has solved the problem |
| C．there are many people in need of glasses | D．there are not enough eye doctors |
| A．who the new glasses are used by | B．how the new glasses are used |
| C．why the new glasses were made | D．where the new glasses were invented |
| A．the new glasses can do good to large numbers of people |
| B．the new glasses must be adjusted by eye doctors |
| C．oil is not necessary for the new glasses |
| D．glasses are easy to get everywhere all over the world |
| A．He thinks they’re the best of all. |
| B．He’s completely uncertain about them. |
| C．He is worried about their future. |
| D．He thinks they have a bright future. |
| A．He will let more people own the new glasses. |
| B．He will invent another new kind of glasses. |
| C．He will decide the price of the new glasses. |
| D．He will make the new glasses cheaper. |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
