关于藻类、苔藓、蕨类植物的共同点是（ ）
A．都生活在水中
B．都有根、茎、叶分化
C．都是不结种子的植物
D．植株内都没有输导组织
答案：C
The milk must be preserved at this temperature until it ____.
A．will process
B．is processed
C．has processed
D．had been processed
( ) is a major port of Brazil.
A．Portland
B．Rabat
C．Rio de Janeiro
D．Rouen
