物理兴趣小组在“探究水果电池电压”的实验中：

小明用铜片和锌片作为电极插入较小的柠檬制成了一个水果电池，如图所示．小华用铜片和铝片插入较大的柠檬也制成了一个水果电池．他们分别连通相同的音乐芯片，小华比小明的芯片声音要响一些．由此他们作出如下猜想：

猜想一：水果电池电压可能与水果的大小有关．

猜想二：水果电池电压可能与电极的材料有关．

下面几项表现了原始人的生产生活情况，在母系氏族社会时期不可能出现的情况是(     )

下列词语中没有错别字的一项是（    ）

    Science museum

    (The Science of Survival, IMAX&SIMEX)

    The Science Museum has something for everyone. Entry to the museum is free. Offer applies to IMAX 3D Cinema, SIMEX and The Science of Survival exhibition only.

    IMAX ￡7.50

    SIMEX ￡4.00

    The Science of Survival ￡6.00

    Opening Times: Daily 10: 00-18: 00 Visit Time: 2 hours

    National Gallery

    Opening Times:

    Daily 10am-7pm Wednesday until 9 pm

    Admission:

    ￡8 adults. ￡4 students, under 12s free

    Tickets:

    Available daily from 10 am

    Telephone: 020 7747 2885

    Visituswww.nationalgallery.com

    ZSL London Z

    There are over 12, 000 amazing animals for you to see. These are just a few things which make a visit to ZSL London Zoo a great day.

    Ticket Price: ￡ 17.00

    Opening Times: Daily 10: 00-17: 30

    Visit Time: 4 hours