【单选题】2001年4月30日,60岁的美国富商蒂托在经过专门的太空飞行训练并支付了2000万美元之后,与另外两名俄罗斯宇航员搭乘俄罗斯的“联盟号”载入飞船飞往距地球400公里之外的国际空间站,成为世界上首位太空游客。这是人类的一小步,但它却是国际旅游业迈出的一大步。正因为此,舆论普遍认为,蒂托此行担负着为世界各地有能力过太空旅游瘾的宇航发烧友探路的使命。在此之后,2002年和2005年又相继有一位南非富商...
【单选题】下列说法正确的是( )
B.
油脂是高级脂肪酸的甘油酯,均不能发生氢化反应
C.
H 2 N-CH 2 -COOH既能与盐酸反应、又能与氢氧化钠溶液反应
【简答题】During the day we work and play, and at night we sleep. Our body rests while we sleep .In the morning we are ready to work and play again. Our body grows most while we are asleep. Children who are tir...
【单选题】Which of the following would be the best title for the text?
A.
All Work and No Play Makes a Company Unproductive
B.
Many Happy Hands Make Light Work
C.
Overwork Results in Health Risks
D.
Efficiency Is Always a Rebound from Hard Work
【单选题】Work and play _______ equally important.
【简答题】Internet is not such an word as it used to be. It has changed the way we live, work and play.
【判断题】甲骨文是中国的一种古代文字,被看作是中国文化的源头。()