问题 选择题

下列说法不正确的是(  )

A.流程图通常有一个“起点”,一个或多个“终点”

B.程序框图是流程图的一种

C.结构图一般由构成系统的若干要素和表达各要素之间关系的连线(或方向箭头)构成

D.流程图与结构图是解决同一个问题的两种不同的方法

答案

有一个“起点”,一个或多个“终点”是流程图的一个重要特征.所以选项A正确;

程序框图是流程图的一种,是人们将思考的过程和工作的顺序进行分析、整理,用规定的文字、符号、图形的组合加以直观描述的方法.所以,选项B正确;

表示一个系统中各部分之间的组成结构的框图叫结构图,结构图一般由构成系统的若干要素和表达各要素之间关系的连线(或方向箭头)构成.所以,选项C正确;

结构图是一个系统的构成部分,就是说一个系统是由哪几部分组成,比如说一个人,是由大脑、手、足等组成.

而流程图是一个系统工作起来的步骤,有先后顺序.当然也可以是设计一个系统所要做的步骤.

所以,不能误认为流程图与结构图是解决同一个问题的两种方法.所以,选项D错误.

故选D.

单项选择题 A3/A4型题
阅读理解

The house was quiet at 5 a.m.and Tim' s mother was asleep. Only the sound of the big freezer broke the quiet. He' d dreamt of the cave last night. The purring (轻微颤动声) of the freezer had been the sea.

Tim pulled on a sweater and put some apples into his schoolbag. It was too early for breakfast. He' d eat after he' d been through the cave, sitting on the rocks and staring at the sea.

He wished he had a proper pack. His schoolbag would have to do. What else? Sandwiches-but his mother might wake up if he started pulling out bread for sandwiches, she' d want to know why he had to leave so early. He settled for some biscuits, and left a note stuck to the table:

Gone to Michael' s. Back tonight, Tim.

The sky was high and soft and light outside, though the sun still wasn't up. Even the highway up the hill was quiet as he made his way down the street. The wind from the sea was fresh and sweet.

The sandhills still breathed heat from yesterday' s sun, though the top of the sand was cool. He ran down to the beach impatiently, but there was no one, just dry sand dancing in the early wind and seabirds marching up and down watching the waves.

The light changed suddenly. The first rays of sunlight stretched (延伸) across the sea. The sun was pushing its way over the edge of the world.

Over the first rocks, along to the point. Tim glanced back. The beach was still empty. The sun sailed higher in the sky.

He could see the cave now, even darker in the morning light. The sand turned silver then dark gold as the water flowed away from it. He had to force himself to go closer. Why was it so much more mysterious (神秘的) now? But it would be silly to go back now after so much trouble. He needn't go in all the way...

43. What did Tim do at the beginning of the story?

A. He left the house quietly.                              B. He had breakfast at home.

C. He left a note on the freezer.                         D. He put a sweater in his schoolbag.

44. "He settled for some biscuits” ( in Paragraph 3 ) means that Tim_______.

A. had to leave the biscuits on the table              B. liked biscuits better than sandwiches

C. had to take biscuits instead of sandwiches       D. could only find some biscuits in the kitchen

45. What made it possible for Tim to see the entry to the cave?

A. The height of the first rocks.                         B. The ups and downs of the waves.

C. The change in the position of the sun.             D. The vast stretch of the sunlit beach.

46. Which of the following statements is TRUE according to the story?

A. The sea looked like a piece of gold.               B. Seabirds flew away when Tim arrived.

C. Tim was the only person on the beach.           D. The sky got dark as Tim reached the cave.

47.In the story, Tim' s mood (心情) changed from_________.

A. loneliness to craziness                                   B. anxiousness to excitement

C. helplessness to happiness                               D. eagerness to nervousness