2. As Jack lies under the bed, there must be somebody sleeping on top of it.
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3. The doctor asks Jack to see him three times a week for two years to cure his fears.
A. 对
B. 错
4. The doctor charges Jack $200 a visit.
A. 对
B. 错
5. Jack is willing to pay the amount the doctor charges.
A. 对
B. 错
伊维菌素霉素临床主要用于（ ）。
A. 螨虫感染
B. 促进生长
C. 病毒感染
D. 线虫感染
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