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Dave is a clerk of a company. He has trouble getting to sleep at night. He goes to see his doctor. And the doctor gives him some extra—strong sleeping pills (安眠药). On Tuesday night Dave takes the pills, sleeps well and awake before he hears the alarm clock. He gets to the office on time, walks in and says to his boss, "I'm OK. I have no trouble getting up this morning." "That's fine." the boss roars, "but where were you on Wednesday and Thursday?"
1．Dave is a policeman. （
2．Dave takes some extra—strong sleeping pills. （
3．Dave wakes up on Wednesday morning. （
4．The boss is angry. （
5．Dave gets to the office on time. （
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
