植物的根尖分生区细胞具有的能量转换器是()
A.细胞膜
B.液泡
C.叶绿体
D.线粒体
答案:D
题目分析:和能量转换有关的细胞器是叶绿体和线粒体,但根尖分生区无叶绿体,故选D。
阅读理解。(对的写“T”,错的写“F”。)
Hello! I am Amy. I am ten. Look, this is my school. The library is on the second floor. The teacher's
office and my classroom are on the second floor, too. The canteen is on the first floor. It's 12:00. It's time
for lunch. Bye!
( )1. Amy is nine.
( )2. The teacher's office is on the first floor.
( )3. The canteen is on the first floor.
( )4. Amy has lunch at 11:00.
()又称为聚焦战略,它是指企业的经营活动集中于某个产品特定的细分市场,而不是针对整个市场上的一种战略。
A.差异化战略
B.成本领先战略
C.集中化战略
D.优势化战略