Rebecca stretched her tired back. “That’s the last seedling (树苗), Pa. Have we planted enough?”
Pa walked to the end of the row of cottonwood seedlings. “No,” he said. “We have to plant trees all the way to that rock over there. We’ll need about twenty more seedlings.”
“I’ll get the seedlings,” offered Rebecca. She longed to cool her feet in the shallow river running through the cotton field.
“You’d better let me go, Miss Petticoats,” teased her twin brother, William. “There are dangers all over this prairie (草原).”
“You may both go,” said Pa. “But hurry back. I’d like to finish before sundown.”
They went across the shallow river to a sandbar where small cottonwood seedlings grew.
Gently, they pulled the seedlings from the sand.
“There! That’s twenty, with a few to spare,” said Rebecca.
“OK,” said William. He led the way to the riverbank, and then stopped. “Look! That’s the dugout (防空洞) we had lived in before we moved here last year,” he said, pointing to a hole on the grassy riverbank.
“Come on, let’s go inside.”
“No,” Rebecca said, “Pa is waiting. Besides, it’s hard to tell what’s in it.”
“Then you go back,” said William, handing the seedlings to Rebecca. I’ll catch up.” He ran to the dugout and stepped inside.
Rebecca wrapped the seedlings in her long apron (围裙) and began to walk. Suddenly she froze in her tracks.
A huge rattlesnake (响尾蛇) moved along the riverbank.
It stopped right in front of the dugout and lay still, coiling up on the warm sunny bank.
“William!” Rebecca shouted. “Don’t come out!”
“Huh?” William’s face appeared at a tiny window beside the door of the dugout.
Rebecca pointed at the rattler. William’s face paled when he saw the snake blocking the doorway. He turned desperate eyes toward Rebecca, and then he glanced behind himself. Rebecca knew what he was thinking: “Were there more snakes waiting in the shadowy corners of the dugout?”
Rebecca’s mind raced, trying to think of a way to get William out of there. An idea popped into her head. It was their only hope. It was risky, but it was the only hope.
“Don’t move,” she said to William in a soft voice. “When I say NOW, you run out of there as fast as you can.”
Rebecca removed the skirt-like petticoat (衬裙) from beneath her dress, and then dipped it into the river. She squeezed out some of the water, and then climbed to the top of the bank, directly above the dugout’s opening.
Paragraph 1:
“Get ready to run, William,” she said, keeping an eye on the motionless snake.
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Paragraph 2:
“Are you OK?” he asked, breathing heavily. Rebecca nodded.
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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

