题干

甲乙两位同学用小球做模拟孟德尔遗传定律的实验。甲同学每次从Ⅰ、Ⅱ小桶中随机抓取一个小球并记录字母组合,乙同学每次分别从Ⅲ、Ⅳ小桶中随机抓取一个小球并记录字母组合。下列说法错误的是(    )

A:两位同学每次从小桶中抓取的小球记录后要放回原桶

B:乙同学的实验可模拟非同源染色体上非等位基因自由组合的过程

C:实验中每个小球大小都应相等,四个小桶内的小球总数都应保持一致

D:甲同学的实验模拟的是遗传因子的分离和配子随机结合的过程

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C

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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.