对于反应，反应产物CH3CN的收率计算公式为（）。 A.A B.B C.C D.D

发明大王爱迪生从小就具有极强的好奇心，在他三岁的时候，对母鸡孵小鸡好奇，于是他就自己找了些鸡蛋，趴在上面学起孵小鸡来了。就是这种强烈的好奇心，引导着爱迪生去研究、探索、创造发明。这说明[ ]

A、好奇心会让人闹笑话，出洋相

B、小孩都有强烈的好奇心

C、只要有了好奇心就能成为发明家

D、好奇心是开启创造力的起点

机器语言程序是计算机能直接执行的程序。（　　）

孙飞虎兵围普救寺，欲掳获莺莺做压寨夫人，众人慌作一团计无所出。莺莺提出的“五便三计”是（）

A.献身于贼

B.献尸于贼

C.投降于贼

D.“不拣何人，建立功勋、杀退贼军，扫荡妖氛，例陪家门，情愿与英雄结婚姻，成秦晋”

A group of frogs were traveling through the forests, but unluckily two of them fell into a hole. The other frogs tried to help them. When they saw how (16) the hole was, they cried to the two frogs that they could not be saved. The two frogs didn’t (17) and tried their best to jump up out of the hole. The other frogs (18) saying that they were sure to die. (19) ,one of the two frogs, who heard what the other frogs were saying, (20) ,then he fell down and died.
The other frog, however, (21) to jump as hard as he could, and at last made it out. When he (22) , the other frogs asked, "Didn’t you hear us" The frog, who had a poor (23) , explained, "I thought you were encouraging me all the time. "
The story teaches us a (24) : There is power(力量) of life and death in the tongue. An (25) word to those who are down can help them out while a discouraging word can kill them.

Ⅱ. 完形填空/Cloze

A．care

B．refuse

C．insist

D．think

要了解小学生的心理发展规律最好采用（）的方法。

A.横向研究

B.观察法

C.实验法

D.纵向研究