问题
选择题
下列各项不能作为鱼类的主要特征的是（ ）
A．体表大多有鳞片
B．用鳃呼吸，一般用鳍游泳
C．终生生活在水中
D．体内有脊柱
答案
鱼类的特征有：体表大多有鳞片；用鳃呼吸，一般用鳍游泳；终生生活在水中；而体内有脊柱不是鱼类特有的特征，如两栖类、鸟类也有脊柱．故不能作为鱼类的主要特征的是选项D．
故选：D
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下列各项不能作为鱼类的主要特征的是（ ）
A．体表大多有鳞片
B．用鳃呼吸，一般用鳍游泳
C．终生生活在水中
D．体内有脊柱
鱼类的特征有：体表大多有鳞片；用鳃呼吸，一般用鳍游泳；终生生活在水中；而体内有脊柱不是鱼类特有的特征，如两栖类、鸟类也有脊柱．故不能作为鱼类的主要特征的是选项D．
故选：D
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| Peace of mind basically means having no stress (压力) or anxiety. It's a state where you know everything is going to be okay. You don't have any 1 or concerns.This is a great thing to experience. 2 , the way of life makes it hard to ever experience this state of mind. Most people go through the opposite where they constantly have stress and 3 of not being able to meet certain expectations (期望) or anxiety over the daily demands of life. Meditation (冥想) can help you 4 peace of mind because it will allow you to 5 and let go of all of the things that are causing you stress and worry. It can be a great way to be at peace with yourself. What you can do is simply sit quietly and just focus on breathing for about 30 minutes. Make sure there are no distractions. If you want, you can play some peaceful music to help 6 a more relaxing environment. The reason for doing this is to train your 7 to be able to feel like it's at peace regardless of what sort of demands of life you have to deal with. The more you do it, the easier getting to this state will be. Having peace of mind comes down to being able to 8 what needs to hold on and let go what should be let go. Let go of things you can't change. Do what you need to do to 9 the situation when there are things you can do to make a change. Once you do all you can do, just let it be.Peace of mind comes when you just let things be and 10 stressing over things that is out of your control. | ||||
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