皮皮学,免费搜题
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【简答题】
Reading Bear is the first free program online to teach beginning readers vocabulary(词汇). It also introduces all the main “phonics rules”(语音规则) of written English using rich media. How does it work? In each presentation we introduce one or a few phonetic rules with a video. Presentations are easy to use. We sound out a word slowly and then quickly. Then we display a picture of the word. When we show a sentence, we sound it out and show a video to give an example for the sentence. Each presentation uses about 25 words. We hope you will use Reading Bear in a non-stressful, non-pressuring way. Learning to read can be fun and easy if you go at the child's step. Go as slow as the student needs to, which might be very slow in the beginning. Your patience will be rewarded. It cannot teach English grammar, but it can help teach reading and vocabulary. Let students understand that they should stay on a presentation only as long as they have to. If they have mastered a set of words, and are getting 14 or 15 out of 15 on the quiz for a presentation, then move on. Reading Bear is a free project. Reading Bear’s images and many of its videos were donated(捐赠) by Shutterstock.com, to whom we wish to offer deep thanks. The rest of the videos were also offered by Shutterstock.com, at a big discount. The project’s designer(设计者) is Larry Sanger, who started the project, designed the software, and carefully made each presentation. Larry is best known as co-founder(共同创立者) and the organizer of Wikipedia. He is the father of two boys, ages 5 and 1. He taught his older son to read at an early age with various tools, including Reading Bear.
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【单选题】1×(1+1/2)×(1+1/3)×……×(1+1/17)的值是( )。
A.
9/2
B.
7
C.
9
D.
17/2
【单选题】下列关于阿伏加德罗常数的说法不正确的是(  )
A.
6.02×10 23 就是阿伏加德罗常数
B.
0.012kg 12 C含有的碳原子数就是阿伏加德罗常数
C.
含有阿伏加德罗常数个粒子的物质的量是1mol
D.
1molNH 3 所含原子数约是2.408×10 24
【单选题】N A 表示阿伏加德罗常数,下列说法错误的是
A.
质量为a g的R分子,其相对分子质量为a N A
B.
12g石墨含有 N A 个碳原子
C.
31g白磷分子(P 4 )中含有6 N A 个共用电子对
D.
30g葡萄糖含有 N A 个碳原子
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A. meet
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A.
【简答题】17,10,9,6,1,2,( )。
【简答题】I’m afraid your requirement of commission is difficult for us to accept. Let’s [填空(1)] each other half way. Mutual efforts will carry us a step forward.A. meet
【单选题】下列关于阿伏加德罗常数的说法不正确的是(  )
A.
0.012 kg 12 C含有的碳原子数就是阿伏加德罗常数
B.
6.02×10 23 就是阿伏加德罗常数
C.
含有阿伏加德罗常数个粒子的物质的量是1 mol
D.
1 mol NH 3 所含原子数约是2.408×10 24
【简答题】Thanks ___ mutual efforts, we were able to bridge the price gap and put the deal through.
【单选题】下列说法错误的是(  )
A.
6.02×10 23 是阿伏加德罗常数的近似值
B.
阿伏加德常数个微粒的物质的量是1mol
C.
1mol碳-12原子的质量为12g
D.
硫酸的摩尔质量是98克
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