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Potatoes were first grown in the Andes in South America. In 1586, they were taken to Europe by explorers(探险家). In 1719, they were taken to North America. Before 1719, nobody in North America had ever seen or eaten a potato. Today, each American eats more than 60 kilos of potatoes a year.
1．Where were potatoes first grown?| A．In North America. |
| B．In Europe. |
| C．In the Andes in South America. |
| A．Artists. | B．Explorers. | C．Doctors. |
| A．In 1719. | B．In 1586. | C．In 1791. |
| A．More than 55 kilos. | B．More than 60 kilos. | C．More than 65 kilos. |
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
