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The e-schoolbag
Heavy schoolbags are bad for students’ health. Now the e-schoolbag will help students.
In fact, the e-schoolbag is a computer for students. It is small and light, but it can store (存储) many things for students, such as textbooks and exercises. Students can also use chips. They can put the right chip into the e-schoolbag and read the textbooks page by page on the screen. Students can also use the e-schoolbag to take notes or send emails to their teachers.
Some people say the e-schoolbag is good for students’ study, but some people say it’s not good for students’ eyes. I think time will tell us the result.
1．The e-schoolbag is a(n) __________. ( )| A．computer | B．mobile phone | C．e-book |
| A．light and big | B．big and heavy | C．small and light |
| A．chips | B．paper | C．exercise books |
| A．talk with their friends |
| B．make chips |
| C．read textbooks and take notes |
| A．We can’t buy the e-schoolbag now. |
| B．The e-schoolbag may be bad for students’ eyes. |
| C．All parents don’t like the e-schoolbag. |
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
