问题 单项选择题

OMT是一种对象建模技术,它定义了三种模型,其中 (18) 模型描述了与值的变换有关的系统特征,通常可用 (19) 来表示。

(19)处填()。

A.类图

B.状态图

C.对象图

D.数据流图

答案

参考答案:D

解析:

当用产生式A→α归约时,LR(0)无论面临什么输入符号都进行归约;SLR(1)则仅当面临的输入符号a∈FOLLOW(A)时进行归约;LR(1)则当在把α归约为A的规范句型的前缀βAα前提下,当α后跟终结符a时,才进行归约。

阅读理解

第四部分阅读理解(共15个小题,每小题1分,满分15分)

In the western part of the United States where the Indians lived, a little mouse called the “bean mouse” became a guide to rich stores of good and tasty difficult-to-find food. Each season, the little animal would work very hard to search out the rare beans, and “cache” them away in its nest (窝). The Indians learned of this and found out the hiding place. They collected most of the beans for themselves. When the mouse returned to its home and found only a few of the tasty beans left, it set to work, harder than ever before, gathering more beans. This was a fine thing for the Indians, who had only to look for the nest, while the mouse had to look for the beans. But the Indians returned the favour (恩惠,善意) by always making sure that the animal had enough for the winter.

61. The Indians valued the bean mouse _________.

A. as a guide to food                                     B. as fertile (肥沃的) land

C. because it made a good pet                              D. because its fur was valuable

62. The underlined word “cache” means _______.

A. throw them in every place                      B. place them in a hiding place for later use

C. put them in its home                                 D. lay them under the mud

63. The passage says that the bean mouse was ________.

A. fearless               B. friendly                    C. rare                     D. hard-working

64. The Indians are shown to be ________.

A. clever                 B. hard-working        C. unkind                D. educated

65. The best title for this passage is _________.

A. Man’s Best Friend                                   B. Habits of the Bean Mouse

C. A Search of Rare Beans                              D. The Indians and the Mouse

单项选择题