下列各组粒子中，每一粒子所含的质子数、电子数都是10的是（ ）
A．He、Ne、Ar
B．Na+、Mg2+、Al3+
C．Ca、Mg、Al
D．Ne、H2O、NH3
A、He、Ne、Ar是不同元素的原子，所以其质子数一定不同，故错误；
B、Na+、Mg2+、Al3+是三种不同元素的离子，所以其质子数一定不同，故错误；
C、Ca、Mg、Al是不同元素的原子，所以其质子数一定不同，故错误；
D、Ne原子的质子数是10其电子数也是10；H2O该分子的质子数为1×2+8=10，由于分子不带电所以其电子总数也是10；NH3该分子的质子数为7+1×3=10，由于分子不带电所以其电子总数也是10；故正确；
故选D
| 阅读理解。 | ||||||||
| A greeting is a way of saying "Hello" to someone. People in different countries greet each other in different ways. Here are some.      a. a handshake b. a bow c. a kiss on the cheek d. a hug e. a pat on the back World Greetings
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| 1. In which country do men sometimes pat each other on the back? | ||||||||
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| A. Philippines B. Brazil C. Japan D. New Zealand | ||||||||
| 2. In this passage, which of the following is NOT mentioned (提及)? | ||||||||
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| A. Kisses B. Hugs C. Bows D. Handshakes | ||||||||
| 3. Of the five pictures above (a, b, c, d and e), which is the same way to greet each other in the four countries? | ||||||||
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| A. a B. b C. c D. d | ||||||||
| 4. Which of the following is TRUE according to the passage? | ||||||||
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| A. Both men and women shake hands in Brazil when they meet. B. Japanese won't smile until they feel very happy. C. The Maori often press their noses together to greet each other. D. In Philippines, people shake hands only when they meet for the first time. | ||||||||
| 5. What does the writer mainly want to tell us in the passage? | ||||||||
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| A. Different ways of greetings. B. Four countries. C. Some fun facts. D. Some special notes. |