Arnold followed Eugie down the slope, stealing, as his brother did, from one stock of wheat to another. Eugie paused before climbing through the wire fence that divided the Wheatfield from the marshy pasture （牧场）around the lake. They were screened from the ducks by the trees along the lake’s edge. “If  you hit your duck, you want me to go in after it?” Eugie said. “If you want.” Amold said. Eugie lowered his eyelids, “You’d drown before you got it, the legs of yours are so weak.” he said contemptuously（轻蔑地）. He shoveled the tub under the fence and, pressing down the center wire, climbed through into the pasture. Arnold pressed down the bottom wire, pushed a leg through and leaned forward to bring the other leg after. His rifle caught on the wire and he pulled at it. The air was rocked by the sound of the shot. Feeling foolish, he lifted his face, uncovering it to an expected shower of derision （嘲弄）from his brother. But Eugie did not turn around. Instead, from his crouching position, he fell into his knees and then fell forward onto hi s face. The ducks rose up crying from the lake, cleared the mountain background and beat away northward across the pale sky. Arnold squatted beside his brother. Eugie seemed to be climbing the earth, as if the earth ran up and down, and when he found he couldn’t scale it he lay still. “Eugie?” Then Arnold saw it, under the rolling hair at the back of the need — a slow rising of bight blood. It had an unpleasant movement, like that of a parasite（寄生虫）. “Hey, Eugie, ” he said again. He was feeling the same discomfort he had felt when he had watched Eugie sleeping; his brother didn’t know that he was lying face down in the pasture. Again he said, “Hey, Eugie,” an anxious push in his voice. But Eugie was as still as the morning about them. 72．What does the underlined word “screened” in Para 1 probably mean? A．Separated.          B．Stopped.      C．Dragged.      D．Hidden. 73．According to the passage, we know that       . A．Eugie always laughed at Arnold B．Eugie would help Arnold hit the ducks C．Arnold begged Eugie to go in after the ducks D．Eugie was worried that Arnold might drown 74．Why did Eugie lie still? A．Arnold shot him intentionally.       B．Arnold killed him accidentally. C．He pretended to be unconscious.     D．He was ready to shoot some ducks. 75．It can be inferred from the passage that         . A．the relationship between Arnold and Euie was not so good B．Arnold followed Eugie approaching the lake to steal ducks C．they were crouching forward to steal the wheat D．Eugie was always taking care of Arnold