溶质的质量分数=　____ ，溶质的质量=____ ．

某化学反应过程的微观示意图如图，下列说法错误的是（　　）

某人用手将1kg的物体由静止向上提起1m，这时物体的速度为2m/s（g取10m/s²），下列说法正确的是（   ）

    Should we allow modern buildings to be built next to older buildings in a historic area of a city? In order to answer this question, we must first examine whether people really want to preserve the historic feel of an area. Not all historical buildings are attractive. However, there may be other reasons—for example, economic (经济的) reasons—why they should be preserved. So, let us assume that historical buildings are both attractive and important to the majority of people. What should we do then if a new building is needed?

    In my view, new architectural styles can exist perfectly well alongside an older style. Indeed, there are many examples in my own home town of Tours where modern designs have been placed very successfully next to old buildings. As long as the building in question is pleasing and does not dominate (影响) its surroundings too much, it often improves the attractiveness of the area.

    It is true that there are examples of new buildings which have spoilt (破坏) the area they are in, but the same can be said of some old buildings too. Yet people still speak against new buildings in historic areas. I think this is simply because people are naturally conservative(保守的)and do not like change.

    Although we have to respect people’s feelings as fellow users of the buildings, I believe that it is the duty of the architect and planner to move things forward . If we always reproduced what was there before, we would all still be living in caves. Thus, I would argue against copying previous architectural styles and choose something fresh and different , even though that might be the more risky choice.

    You cannot choose your child's friends for him, but you can help him learn to choose friends wisely.____ Here are a few ways to help your child make friends.

    Build your child's self­confidence.

     When he succeeds or has made a great choice, tell him you're proud of him.____ Your middle school student is going through many changes and may feel like he isn't “good enough”. Building his self­confidence will help him feel more confident and will make it easier for him to form healthy friendships.

    ____

    Give him your full attention when he talks, and really listen to what he has to say.

    Discuss the qualities in a friend with your child.

    Discuss with your child the qualities that matter most, such as being reliable and kind, and making good choices when it comes to avoiding alcohol and tobacco.

    Get to know your child's friends.

    ____It's more important to talk with them and find out what they like to do. Allow your child to invite his friends over and get to know them better.

    ____

    Afterschool clubs and sports programs are good places for meeting new people. Be open to exploring different activities with your child to find something that he enjoys.

A. Friends are very important for us.

B. Introduce your child to new groups of people.

C. Talk with your child every day and listen to his concerns.

D. Try not to judge your child's friends based on how they dress.

E. When he does not succeed, help him feel better and keep trying.

F. You can teach him ways to find friends who will have a positive influence on him.

G. There are many types of friends and we should be careful when making our choices.