下列节肢动物中，属于昆虫的是
A．蜘蛛
B．螃蟹
C．蝉
D．蜈蚣
答案：C
题目分析：蝉的身体可分为头、胸、腹三部分，两对翅膀三对足，身体外有外骨骼等为昆虫，而蜘蛛身体分为头胸部和腹部，有4对足，属于节肢动物蛛形类，螃蟹用鳃呼吸，身体分为头胸部和腹部，头胸部具发达的头胸甲．属于肢动物甲壳类，蜈蚣的身体是由许多体节组成的，每一节上有一对足属于节肢动物多足类．
A: Would you mind coming here, dear? B: OK.I am coming right away. 【1】 A: You see, there is lots of housework in the kitchen. B：【2】 A: Yes, you do. And you have to help me cook dinner. B: OK. When I finish, could you help me with my homework? A: Your homework? 【3】 B: No,I haven't. It's too difficult for me. A: 【4】 B：Since breakfast. A: You know, dear, I'm afraid I can't help you. I'II have to do some shopping after lunch. B: But what about my homework? A:I think you should make a telephone call to your friend, Jane,【5】 B：That's a good idea.
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