题干

对某种动物的肝肿瘤细胞进行细胞培养。下列说法错误的是 (  )

A:在利用肝组织块制备细胞悬液时,可用胰蛋白酶或胶原蛋白酶处理

B:动物细胞培养应在含5%CO2的恒温培养箱中进行,CO2的作用是刺激细胞呼吸

C:为了防止动物细胞培养过程中细菌的污染,可向培养液中加入适量的抗生素

D:在合成培养基中,通常需加入血清、血浆等天然成分

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B

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    Minutes

    Green Building Committee (委员会) Meeting, Wing Lung School

    Date and time: 4 p.m. March 5th, 2017

    Present: Mr. To (Principle), Ms. Man, Mr. Cheung, Ms. Sin (committee members)

1)Opening

    Mr. To opened the meeting and welcomed Ms. Sin as a new committee member.

2)The Green Building Project

    In order to make Wing Lung School more environmentally friendly and to make students take notice of  environmental problems, such as rising temperature of the Earth, it has been decided that work on The Green Building Project would begin in June.

①Solar panels (太阳能电池板)

    Plans to install solar panels on the rooftop of the main building have been decided.

②Roof garden

    Ms. Man pointed out that a roof garden could make the temperature in the main building become lower. However, it has been decided that the school could not afford to build a roof garden at present.

③Water tank (水箱)

    Plans for the installation (安装) of a water tank on the rooftop to collect water for toilets were passed.

④Timers on light switches

    It has been decided that timers would be installed on light switches in all classrooms so that lights would switch off automatically(自动地) at the end of the day.

3)A speech

    It was agreed that a speech would be given to tell students information about the project at 4 p.m. on March 28th in the school hall.

4)There being no other business, the meeting was ended at 5 p.m.