使花卉叶片形成缺刻、孔洞等为害状的害虫的口器类型是()。
A、刺吸式
B、咀嚼式
C、虹吸式
D、舐吸式
参考答案:B
在下列各句的空格内填上一个适当的完整的单词,该词的首字母已给出。
1. He has v_________ a lot of places since he came to Ningbo.
2. When summer comes, day becomes longer and n_________ becomes shorter.
3. It's our duty to help b_________ people because they aren't able to see.
4. Hurry up, or we won't c_________ the early bus.
5. P_________ are my favorite animals and they live only in China.
有两个细胞,每30分钟进行一次分裂,两个小时后,一共有几个细胞[ ]
A.16
B.32
C.24
D.48