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问题 多项选择题

Excel的窗口主要包括（）等屏幕元素。

A.标题栏

B.菜单栏

C.工具栏

D.编辑栏

答案

参考答案：A, B, C, D

解析：标题栏、菜单栏和工具栏是Word和Excel软件中都有的窗口元素，而编辑栏是Excel独有的窗口元素。

问答题

尿素的化学式是[CO（NH2）2]，请根据化学式回答问题：

（1）尿素中C、O、N、H元素的原子个数比为______．

（2）尿素中C、H元素的质量比为______．

（3）尿素的相对分子质量为______．

（4）尿素中C元素的质量分数为______．
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单项选择题

Once a man and his wife worked for an old man. There was a big box in the old man’s living room. The old man pointed to the box and said, "There’s only one thing you (1) do. Don’t open the box. " (2) saying this, he left his home.The woman said to her husband," There must be (3) expensive in the box. Let’s open it, shall we" Her husband said (4) to her. But the woman didn’t give up her (5) . One day, she decided to find out (6) was in it. Her husband didn’t stop her. She opened the box and looked inside. To her surprise, she found nothing in the box. She tried hard to close it, but she (7) That evening the old man came home and found the box was (8) . He was very (9) and asked the woman and her husband to leave his home."But there was nothing in the box," the woman said. "We haven’t taken anything at all. "The old man (10) them, "The box is not important, but I cannot believe you. That’s important!

 

第（3）空应选择（）

A．nothing

B．everything

C．something

D．anything
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