若P= a+2 +a+5 ，Q= a+3 +a+4 （a≥0），则P，Q的大小关系为

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若P= a+2 +a+5 ，Q= a+3 +a+4 （a≥0），则P，Q的大小关系为（）

A：P＞Q

B：P=Q

C：P＜Q

D：由a的取值确定

上一题下一题 0.0难度选择题更新时间:2019-07-20 03:43:47

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C

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如图是植物细胞模式图，如表是某同学根据此图写出的图中部分编号所指结构的功能，其中不正确的是（　　）

	图中编号及所指结构的功能
A	①能控制物质进出细胞
B	②与③为能量转换器
C	⑤内含有叶绿色使细胞显绿色
D	④内含有染色体，是遗传信息库

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短文改错。

One of my favourite cartoons are Pleasant Goat and Big Big Wolf. I have seen many cartoons. Because Pleasant Goat and Big Big Wolf is my favourite. I like it because it's much modern than another cartoons. The story is about a clever goat. It is the hero of the story. It's clever and brave. It always finds ways help other goats run away from Big Big Wolf. It leads other goats fighting the Big Big Wolf. They protect each other and work hardly together and they are always successful. The cartoon is very interested. I can't always help to laugh. If you haven't saw it yet, please don't miss it.

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