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1．The main purpose of the text is to .
| A．give instructions on making a rocket | B．introduce the Acme Rocket Launcher |
| C．show different kinds of rockets | D．encourage rocket drawing |
| A．It can be of any size. | B．It must be made of glass. |
| C．It should be clean and dry. | D．It needs to be filled with cola |
| A．the cola bottle | B．the poster board |
| C．a small triangle | D．the large triangle |
A． | B． | C． | D． |
| A．Sports News. | B．Job Wanted. |
| C．Do It Yourself. | D．Lost and Found. |
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
