皮皮学，免费搜题
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搜题
【单选题】
牙骨质含有机物和水A.
约 40 ％～ 45 ％
B.
约 80 ％～ 85 ％
C.
约 50 ％～ 55 ％
D.
约 60 ％～ 65 ％
E.
约 70 ％～ 75 ％
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举一反三
【单选题】What do you think of the color of my clothes?
A.
Yes,it is beautiful.
B.
No,I don’t like it.
C.
I think it is fashionable and fits you well.
D.
I don’t think so.
【简答题】根据答案与题目，回答下列各题。 A．I enjoy P．E．at school． B．I like basketball． C．What kind of movies do you like，then? D．Because it's excitinG． E．Frequency．It’s an action movie and it's interestinG． F．Oh，I like comedi...
【简答题】有一种牙膏侧面的标签如图： （1）单氟磷酸钠的化学式是Na 2 PO 3 F，其相对分子质量为 __ 。 （2）该支牙膏含氟的质量为__ g。 （3）牙膏水溶液能使pH试纸变蓝，则其呈 ___ (填“酸'“中'或“碱”)性。 （4）可用草酸铵[ 化学式为(NH 4 ) 2 C 2 O 4 ]检验牙膏摩擦剂中阳离子，生成草酸钙沉淀，草酸铵和氯化钙溶液反应的化学方程式为 ，该反应的基本类型为 __ 反...
【单选题】Nowadays most people decide quite【61】what kind of work they would do. When I was at school, we had to choose【62】when we were fifteen. I chose scientific subjects. '【63】, scientists will earn a lot of ...
A.
early
B.
presently
C.
soon
D.
quickly
【单选题】(Two friends are talking about playing computer games) A: What do you usually do in the evening? B: I often play computer games. 61—————— A: I don‟t like computer games. It wastes much time. B: 62————...
A.
How about you?
B.
So you are often late for school.
C.
Then what do you usually do?
D.
I‟ll take your advice.
E.
I do play sometimes.
【单选题】Nowadays most people decide quite【61】what kind of work they would do. When I was at school, we had to choose【62】when we were fifteen. I chose scientific subjects. '【63】, scientists will earn a lot of ...
A.
early
B.
presently
C.
soon
D.
quickly
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