问题 填空题

写出下列物质或微粒的符号或名称

(1)氧化铝______;

(2)正六价的硫元素______

(3)两个铁离子______.

答案

(1)根据分子的表示方法:正确书写物质的化学式,表示多个该分子,就在其化学式前加上相应的数字,因此氧化铝 表示为:Al2O3;故答案为:Al2O3

(2)根据元素化合价的表示方法:确定出化合物中所要标出的元素的化合价,然后在其化学式该元素的上方用正负号和数字表示,正负号在前,数字在后,因此正六价的硫元素表示为:

+6
S
;故答案为:
+6
S

(3)根据离子的表示方法:在表示该离子的元素符号右上角,标出该离子所带的正负电荷数,数字在前,正负符号在后,带1个电荷时,1要省略.若表示多个该离子,就在其元素符号前加上相应的数字;因此两个铁离子表示为:2Fe3+;故答案为:2Fe3+

完形填空

Money Matters

Parents should help their children understand money. ­­­  小题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(功能) 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 things that 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).   小题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(着手处理) money lessons with openness and honesty.    小题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.    小题4: _

Begin at the grocery(杂货) store. Pick out similar brands(品牌) 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. _ 小题5: __ If he chooses the cheaper brand, allow him to make another purchase(购买) with the money saved. Later, you may explain how the more expensive choice leaves less money for other purchases.

A.Wise decision.

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.

填空题