下列有关物质用途的叙述中，不正确的是（） A．氢氧化钠用_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题选择题

下列有关物质用途的叙述中，不正确的是（　　）

A．氢氧化钠用于改良酸性土壤

B．液氮用于超低温实验

C．碳酸氢钠作发酵粉

D．食盐作调味品

答案

答案：A

单项选择题

寒冷地区某地下室长100m、宽90m，水土无侵蚀性，仅考虑混凝土收缩问题，地下室外墙混凝土强度等级适宜的是：（）。

A.C30

B.C35

C.C40

D.C50

补全对话，情景问答

根据对话内容，用方框中所给单词的适当形式填空。

good, homework, study, and, party, flower, listen

M: What are your plans for the weekend, Gina?
W: On Saturday morning, I'm going to check my email and then do my 1.______.
     In the afternoon, I need to go to a piano lesson. How about you?
M: Well, I plan to buy some 2. ______ for my mom's birthday on Saturday afternoon.
W: There will he a 3. ______ at a friend's home on Saturday evening. We're going to 4. ______
     to some music. Would you like to come?
M: Yes, that's a 5. ______ idea.
W: Are you doing anything special on Sunday?
M: No. I just want to stay at home and 6.______ for my test. And you?
W: I'll meet Linda and Tony at 9:00 am in the park, 7. ______ we're going to have a picnic there.
    Join us, will you?
M: Sure, I'd love to!