【判断题】大莱卡的卡面背景是制作精良的世界地图和水平状波浪纹。()
【判断题】Four major car manufacturers have about half of the worldwide car market.
【单选题】The car _____ got four wheels. [ ]
【判断题】无风时,波浪较大的区域为浅水区,细波涟漪的麻纹浪或平静水域为深水区。
【单选题】电视业的崛起,导致了电影业的衰退,这是一种( )。
【单选题】conversations 1
C.
changed eating habits.
D.
lower production cost.
【单选题】conversations1
A.
The English grammar is quite easy.
B.
It is greatly influenced by French.
C.
It could be pronounced easily.
D.
It is attractive to English beginners.
【简答题】(1)写出下列反应的化学方程式:钠在空气中加热______,过氧化钠和水反应______ (2)用双线桥法表示下列氧化还原反应中电子转移的数目,并指出氧化剂.MnO 2 +4HCl(浓) △ . MnCl 2 +2H 2 O+Cl 2 ↑ 氧化剂______.______.