电子商务下，物流系统的信息化必将提高整个物流系统的运作效率，从而提高整个电子商务企业

花园路小学一共种植了200棵树苗，其中15棵未成活，这批树苗的成活率是______．

Today only one person in five in the United States lives within 50 miles of his birthplace. Since the country was first settled, Americans have moved around a great deal, and are often far away from their parents. Because they have broken ties with their past at a young age, chosen their own occupations, established their own homes and developed their own lifestyles, few American children grow up closely surrounded by grandparents, aunts, uncles and cousins as they do in Italy, Nigeria, or India, for example. This along with the fact that modern American families do not have servants has made the “baby-sitter” a vital part of the American scene. A “sitter” is someone who is hired to care for children for a specific length of time—usually relatively short—while the parents are out for an evening, going to a party or a course of study for example. Sometimes the baby-sitter is also hired for longer period, perhaps when the parents are away for a weekend. In such cases the “sitter” is likely to be a mature and motherly woman. For short periods, teen-agers, college students, nursing students, and others are commonly employed on an hourly basis.

From the point of view of convenience, the best sitters are often young people who live in your apartment building or close by in the neighborhood. This gives you a chance to meet the parents and see what they are like. If an emergency occurs, young sitters can call upon their parents quickly for help; you do not have to take them far to see them home at night or pay expensive taxi fares. Another advantage is that young people living close by can usually fill in quite readily on short notice or for short periods of time.

In an apartment house you can ask the superintendent for permission to post a notice for a baby-sitter by the mailboxes. This is often the best way to find out if there is anyone in the building who is interested in baby-sitting. Retired people as well as students are often glad to earn a little money in this way and can be found by such a note.

小题1:A baby-sitter is a person who________.

A．helps to do housework

B．is a cleaning woman

C．looks after children while their parents are out

D．takes care of babies and cooks for the family小题2:It is advised that when you are out for short periods, you may hire________ to be baby-sitters.

A．motherly women

B．retired people

C．young people

D．mature women小题3:The best title for the passage is________.

A．American Families

B．Baby-Sitters

C．A Way of Earning Money for Young Students

D．A Best Way to Find Baby-Sitters

对基金当事人在信息披露中的职责，叙述错误的是( )。

A．基金发起人、基金管理人和基金托管人等基金当事人将基金契约报中国证监会审核批准
B．发行协调人协助基金发起人，根据《招募说明书的内容与格式》编制并公告招募说明书
C．发行协调人就基金发行具体事宜编制并公布发行公告
D．基金管理人编制基金上市公告书，会同基金托管人在上市交易日前1个工作日内刊登在指定报刊上，同时报中国证监会和上市的证券交易所备案

有关胃癌的转移，错误的描述是

A．可直接蔓延
B．早期多为血行转移
C．可腹腔种植于腹膜、大网膜
D．淋巴转移是最主要转移方式

什么叫摩擦力界？影响摩擦力界的因素是什么？