【单选题】Which of the following best expresses the writer's attitude towards early day care?
A.
Children under three should stay with their parents.
B.
Early day care has positive effects on children's development.
C.
The issue is controversial and its settlement calls for the use of statistics.
D.
The effects of early day care on children are exaggerated and parents should ignore the issue.
【单选题】薄层色谱法分离生物碱类药物常采用的条件是:
【多选题】一切商品都包含着使用价值和价值二因素,商品是使用价值和价值的统一,这表明
D.
有使用价值也是劳动产品,但只是供自己消费,也不是商品
【多选题】领队在出境旅游前应做好的准备工作主要有( )。
【单选题】Which of the following best expresses the writer's attitude towards early day care?
A.
Children fewer than three should stay with heir parents.
B.
Early day care has positive effects on children's development.
C.
The effects of early day care on children are exaggerated and parents should ignore the issue.
D.
The issue is controversial and its settlement calls for the use of statistics.
【单选题】薄层色谱法用于药物鉴别,具有特异性强,但常须采用对照品是因为:
【单选题】( )源于营口盖州农村祭祀娱人的一种演出形式
【简答题】领队在出境旅游前应做好的准备工作主要有()。A. 听取计调人员关于旅游团情况介绍B.接收计调人员移交的旅游团有关资料 B. 接受计调人员移交的旅游团有关资料 C. 熟悉所率旅游团的旅游接待计划D.做好出境旅游的有关物质和知识准备 D. 做好出境旅游的有关物质和知识准备 E. 与所率旅游团旅游者通电话联系
【多选题】一切商品都包含着使用价值和价值因素,商品是使用价值和价值的统一。这表明( )
A.
缺少使用价值和价值任何方面, 都不能成为商品
D.
有使用价值,也是劳动产品,但只是供生产者自己消费,也不是商品
【单选题】Which of the following is derivable from Bowlby's work?
A.
Day care would not be so popular if it has noticeable negative effects on a child's personality.
B.
Day care nurseries have positive effects on a child's development.
C.
A child sent to a day care center before the age of three may have emotional problems in later life.
D.
Mothers should not send their children to day care centers until they are three years or older.