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 Invention 1 | These glasses are made from a special liquid(液体). They allow users to adjust the focus(调整焦距) of the glasses until everything is clear. They are designed for children. So they won’t buy new glasses every time when their eyesight changes. |
 Invention 2 | The Donkey Bike has a strong steel bar(钢条) running along it. It can carry both a gas can and a pet at the same time when you ride this bike. |
 Invention 3 | This machine looks friendly and is called Little Printer. It can print news headlines, riddles and other things on a roll(卷) of paper. So you can make your own little newspaper with it. |
1．The special glasses are made from ______.
| A．steel | B．liquid | C．paper |
| A．It can carry four persons. |
| B．It is designed for children. |
| C．It includes a strong steel bar. |
| A．cleaning the cover of the machine |
| B．printing your own newspaper |
| C．reading news headlines or riddles |
| A．Invention 1 | B．Invention 2 | C．Invention 3 |
| A．the change of eightsight | B．a gas can and a pet | C．some cool inventions |
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
