问题 填空题

某粒子结构示意图为,当=10时,其粒子符号为         ;当=11时,其粒子符号为         ,属         离子。

答案

Ne      Na+     阳

题目分析:当x=10时,核电荷数=核外电子数,所以该粒子表示的是一种原子,质子数是10的原子是氦,其符号是Ne;当x=11时,表示该粒子失去了1个电子带1个单位的正电荷,质子数是11的原子是钠,其粒子符号是Na+,属于阳离子。

选择题
阅读理解

(阅读下列短文,从每题所给的四个选项(A、B、C、D、E、F和G)中,选出最佳选项,并在答题卡上将该项涂黑。如选E填涂AB, 选F填涂BC,选G填涂CD)

Money Matters

Parents should help children understand money.   1    So you may start talking about money when your child shows an interest in buying things, candy or toys, for example.

1. The basic function of money

Begin explaining the basic function of money by showing how people trade money for goods or services. It’s important to show your child how money is traded for the thing he wants to have. If he wants to have a toy, give him the money and let him hand the money to the cashier (收银员).   2  When your child grows a bit older and understands the basic function of money, you can start explaining more complex ways of using money.

2. Money lessons

Approach money lessons with openness and honesty.   3   If you must say no to a child’s request to spend money, explain, “You have enough toy trucks for now.” Or, if the request is for many different things, say, “You have to make a choice between this toy and that toy.”

3.    4   

Begin at the grocery store. Pick out two similar brands of a product — a name-brand butter and a generic (无商标产品), for example. You can show your child how to make choices between different brands of a product so that you can save money,    5   If he chooses the cheaper brand, allow him to make another purchase with the money saved. Later, you may explain how the more expensive choice leaves less money for other purchases.

A. Wise decisions

B. The value of money

C. Permit the child to choose between them.

D. Tell your child why he can—or cannot—have certain things.

E. Ask yourself what things that cost money are most important to you.

F. Talk about how the money bought the thing after you leave the toy store.

G. The best time to teach a child anything about money is when he shows an interest.