一场夜雨,又是“绿肥红瘦”.关于桃的绿叶和红花细胞中能量转换器说法正确的是( )
A:在植物细胞中只有叶肉细胞中有叶绿体
B:花瓣细胞中没有叶绿体,所以没有能量转化器
C:花瓣细胞中只有一种能量转化器,而绿叶细胞中有两种能量转化器
D:绿叶和红花中都有能量转化器,只是绿色部分的转化器是叶绿体,花瓣细胞中只有线粒体
下列关于性染色体的叙述,正确的是( )
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A dog is walking along a road. It is a big dog. It is carrying a piece of meat. The piece of meat is in the dog's mouth. The dog is walking across a bridge now.There is water under the bridge. The water is very deep. The dog is looking into the water. It can see a dog in the water. This dog has a piece of meat in its mouth, too. The big dog is barking at the dog in the water. It wants its piece of meat, too. The big dog's piece of meat is falling into the water.