单项选择题

The production and use of the Chinese brush can be dated back several thousand years. It is made primarily of hairs from a wild animal and a small bamboo pipe. ( )

A．对
B．错

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学生奖励分为（）

答案：正确答案：常规奖励和非常规奖励

多项选择题

Which of the following parameters of the neoplastic cells best predicts chemotherapy response?

A．Doubling time
B．Extent of apoptosis
C．Gene amplification
D．Growth fraction
E．Telomerase expression