A：蛔虫消化器官简单，适于在人体消化道内寄生生活
B：蝗虫有外骨骼，适于在陆地干燥的环境中生活
C：鲫鱼用鳍游泳，适于在水中生活
D：兔牙齿有门齿、犬齿和臼齿的分化，与食草生活相适应
—You must get a high income by doing that kind of job.
—Oh，my income's rather variable，but I earn 100 yuan a day________.
下列运算正确的是（ ）
- What can you see?
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