工人挖基坑时,操作人员之间的安全距离一般应大于( )m。
A.2
B.2.5
C.3
D.3.5
参考答案:A
甲商品与乙商品是互补商品,丙商品是甲商品的替代品。在不考虑其他条件的情况下,下列变化会导致甲商品价格降低的是( )
①乙商品的需求量减少 ②乙商品的生产成本降低
③丙商品的需求量减少 ④丙商品的社会劳动生产率提高
A.①③
B.②③
C.①④
D.②④
根据下列句子的意思, 用所给单词的正确形式填空。
1. —What do you think of this film?
—It's quite ______ (education).
2. Our English teacher has a special way to make his lessons ______ (live) and interesting.
3. Victoria ______ (fall) were discovered in 1855, and named in honor of Queen Victoria.
4. You know China very well. Could you give me some ______ (suggest) for vacation spots?
5. Most teenagers dream of becoming a computer ______ (programming).
6. Don't forget ______ (pack) some heavy clothes before you go to Russia in winter.
7. I'm ______ (consider) visiting my grandma this weekend.
8. China is a country with a long ______ (historic) in the world.