设z=1–i（i是虚数单位），则复数$\frac{2}{z}$＋i²的虚部是

    Hi!My name's Ernie. I'm 13 years old and I go to a middle school.

    Here I want to talk about my classroom. It is small, but new and nice. There are big windows so there is a lot of light. There is a table for the teacher and 12 desks for the students. Two students share(合用)one desk. There is a blackboard on the wall. On the other walls there are some pictures of animals--elephants, bears and horses. There are also two maps here. One is a map of Great Britain and the other is a map of Europe(欧洲). There are four computers in my classroom. I sit in Row One and share a desk with Linda,She is my new classmate and my best friend, too.

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下列各组动物中，都用鳃呼吸的是（　　）