Early one weekend morning. I was sleeping like a log when the telephone rang. It was Grandma. She invited us to her home in the countryside. After a quick breakfast, Dad and I drove to Grandma's.
Once we arrived, we were both thrilled by the breathtaking landscape. The plum trees in the backyard were ripe with fruit, while millions of wildflowers colored the valley. Grandma prepared delicious lunch including her special homemade apple jam, which was my favorite. Talking and laughing, we didn't even notice that it was late in the afternoon. Though somewhat cooler than it had been that morning,Grandma suggested that we take her homemade wooden boat for a tour along the nearby river.
Seated in the boat, looking up at the sky. I felt like the clouds were greeting us cheerfully from above. In the vast fields, the golden trees were like brides in the sun. The breeze skimmed over the surface of the field, carrying the sweet smell of the flowers. "It is so nice to spend some quality time with family." Dad murmured. "It feels like we're on an adventure." I added. "It's been so much fun!"
While we were admiring the splendid setting around us. the weather started getting hot and humid again. At first, we ignored this change, but when dad looked up at the sky, he saw dark, low clouds were approaching us. Then a fierce gale(大风)sprang up. Lightning flashed within the black clouds, followed by a roar of thunder. "Row!" Dad shouted, trembling, "A tornado(龙卷风)is coming!"
There was no time to think. We rowed as fast as we could
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Grandma opened the door for us.
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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

