从所给的四个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（） A． B．

请描述细胞核、染色体、DNA、基因四者在概念上的大小关系：（  ）

A．细胞核＞DNA＞染色体＞基因   B．细胞核＞染色体＞DNA＞基因

C．染色体＞细胞核＞DNA＞基因   D．染色体＞DNA＞细胞核＞基因

某出口商品每件净重30kg，毛重34kg，体积为每件40cm×30cm×20cm，如果班轮运价计算标准为W/M，船公司应按货物的什么计收班轮运费( )

A．净重

B．毛重

C．体积

D．件数

用括号内所给动词的适当形式填空

Richard is a middle school student. He   小题1:  (live) in an apartment. His school is about ten kilometers from his home. He  小题2: (get) up at 6:00 every day. He leaves home and rides to school at 7:30. He rides to school. He has lunch at school. School is over at four. He doesn’t like      小题3:  (watch) TV after school, so his sight(视力) is very good. .

It   小题4:  (be) Sunday yesterday. He didn’t get up early. He got up at 7:30. After he       小题5:  (have) breakfast , he went to the book store. He bought an interesting book. Then he went to the film.

处置氯气泄露事故时，对现场轻微中毒人员应立即转移到空气新鲜处，对接触毒物的皮肤、面部可用水冲洗，症状严重者立即送医院诊治。（）

操纵器数量较多时，其布置与排列应按（）顺序考虑。

A.操作习惯、逻辑关系、操作顺序、重要度

B.重要度、使用频率、操作顺序、逻辑关系

C.操作顺序、使用频率、逻辑关系、重要度

D.逻辑关系、操作顺序、重要度、使用频率