下列是有关嗜酸性粒细胞直接计数稀释液作用的正确叙述,但除外()
A.破坏红细胞
B.使嗜酸性粒细胞分布均匀
C.保护嗜酸性粒细胞
D.使嗜酸性粒细胞着色
E.防止血液凝固
参考答案:B
阅读理解,将正确答案的序号写在题前括号里。
It's Sunday morning. There are some Young Pioneers in the park. They are having a good time. Look! Some
boys are playing football on the grass. Some girls are singing and dancing under the big tree. Oh, where is Peter?
He's sitting by the lake. What's he doing? He's reading a book. Where is Linda? She's over there. She's flying a
kite. How happy they are!
1. There are some in the park. [ ]
A. Young Pioneers
B. boys
C. girls
2. Are they having a good time? [ ]
A. Yes, it is.
B. Yes, they are.
C. No, they aren't.
3. Peter is . [ ]
A. playing football
B. singing
C. reading a book
4. Linda is .[ ]
A. dancing
B. flying a kite
C. sitting
下图分别是蓝藻(左图)和衣藻(右图)的结构模式图。请据图回答:
(1)两者虽然在结构上都具有_______、_______、________等,但是衣藻属于真核生物,因为:_____________。
(2)蓝藻有好多种,蓝球藻、团藻、颤藻、念珠藻中,不属于蓝藻的是__________。
(3)蓝藻细胞中含有________和________两种物质,也能够进行光合作用,属于______(真核或原核)生物。