问题 选择题

下列物质中既能跟稀H2SO4反应,又能跟氢氧化钠溶液反应的是      ( )

①NaHCO3②Al2O3③Al(OH)3④Al

A.③④

B.②③④

C.①③④

D.全部

答案

答案:D

考查元素及其化合物知识

铝、氧化铝为两性氧化物、氢氧化铝为两性氢氧化物、多元弱酸的酸式盐均可与强酸、强碱反应,故答案为D

完形填空

Fruit and vegetables should be a part of what we eat every day. Educating your children about the importance of eating fruit and vegetables is important for their health. Here are some fun activities to help you teach your children about fruit and vegetables.

★ Reading is one excellent way. Choose a colorful book with many different types of fruit and vegetables.

★ Provide your children with fruit and vegetable puzzles. Your children will be able to see what fruit and vegetables look like as they’re putting the puzzles together. You can also teach them the different names of fruit and vegetables.

★ Each day give your children different fruit and vegetables to eat. This will give them the chance to taste many kinds of fruit and vegetables. Talk to your children about what they look like and how they taste and smell.

★ Play fruit and vegetable games. Prepare little cups with fruit and vegetables cut up into small pieces. Cover your children’s eyes and give them one of the cups to try. After tasting, they have to guess what kind of vegetable or fruit it is.

★ Grow vegetables. You can teach your children how vegetables grow by planting them. Your children will also learn how to take care of vegetables.

Judge the following sentences true ( T ) or false ( F ) according to the passage.

小题1: Reading is a good way to help your children know about fruit and vegetables.

小题2:The puzzles can help children know how fruit and vegetables taste and smell.

小题3: By playing fruit and vegetable games, children can know what fruit and vegetables look like.

小题4: Growing vegetables can teach your children how to look after vegetables.

小题5: The passage is mainly about the advantages of eating fruit and vegetables.

选择题