题目内容

第一印象是：对一个人形成的最初的看法（）

A. 对
B. 错

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Section B8.A) By bus.B) ON foot.C) By taxi.D) By bicycle.9.A) A report.B) A project.C) A plan.D) A design.10.A) He is an engineer.B) He is a doctor.C) He is a programmer.D) He is a manager.11.A) Dealing with angry customers.B) Writing work reports.C) Giving presentations.D) Working on weekends.12.A) To visit friends.B) To see a doctor.C) To take a holiday.D) To do business.13.A) It had a flat tire.B) Its front window was broken.C) It was out of fuel.D) Its rear window was broken.14.A) Attend a job fair.B) Read newspapers.C) Visit the website .D) Ask her friends for help.

P 140T2Answer the following questions.

细胞冻存时，常用的冷冻保护剂有（）和甘油。（）对大部分细胞无毒性作用，在细胞冻存液中被广泛使用，其常用的最终浓度为（）。

从其他实验室购买的细胞株,经过()稳定传代后,应该及时冻存。