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| A．never | B．computer | C．sometimes | D．e-mails | E．Internet | F．often |
（_____） 2. There is a big __________ lab in our classroom building.
（_____） 3. --- How _________ does Peter go to Nanjing? --- Once a year.
（_____） 4. In the past, we usually write letters to each other, but nowadays we write __________.
（_____） 5. I am afraid of water. So I __________ swim in the water.
（_____） 6. Jimmy has a lot of friends. He always talks to them on the ________.
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
