制作人体口腔上皮细胞的临时玻片标本时，刮取细胞的部位和在载玻片中央滴加的液体分别是（　　）

假定你是李华，你的美国朋友Tom一周前给你发了电子邮件，询问你暑假里的打算，但你因准备期末考试未能及时回复。

请根据以下要点给他回邮件。1）未及时回信的原因。

      2）你假期的打算（如做兼职 旅游 做志愿者等）。

注意：1）词数120左右。

      2）可适当增加细节，使行文连贯。

Zero Waste Awards

    Who should enter?

    Entries(参赛作品) are welcomed from anyone who processes waste. While we expect

    most entries to come from the UK, we welcome international entries, too. Entrants have been split into the following groups: private sector, public sector, community sector and partnerships.

    What are the categories?

    There're five categories which are based on the Waste Hierarchy(层级). We appreciate that companies will have different strengths within those categories as they work towards Zero Waste. The broad categories are: waste prevention, re-use, recycle/recover, energy recovery, general.

    How do I enter?

    Submitting an entry is really easy! Just follow these few simple steps:

    1) Carefully read through the category information;

    ). Write your entry--it should be a maximum of 1,500 words and a word document;

    3) Arrange your supporting material into a single document--maximum six pages long;

    4) Complete the simple online entry form.

    Important dates

    While entries are welcomed all year round, these are key dates—this is to give the judges plenty of time to read through all the entries! These are listed in entry deadlines column below. Don't worry if you have just missed one of the entry deadlines, your submission will be automatically entered into the next session.

    You can submit a maximum of two entries per year—six months apart.

    Awards

    We understand that working towards Zero Waste is an ongoing journey and as such the

    Zero Waste Awards scheme offers organizations a structure to celebrate their progress along the way. The four awards are: Gold (76-100), Silver (51-75), Bronze (26-50), Highly Commended(0-25).

下列粒子的结构示意图中属于阴离子的是（   ）