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（1）six + four = _______
A.ten B.seven C.eleven
（2）three + five = _______
A.eight B.nine C.twenty
（3）seven + two = _______
A.nine B.eight C.forty
（4）one + five = _______
A.six B.thirty C.eight
（5）three + four = _______
A.seven B.fifty C.seven
（6）two + three = _______
A.five B.twenty-four C.twelve
（7）four + five = _______
A.nine B.one hundred C.ninety
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
