人不易作为传染源的疾病是()。
A.流行性乙型脑炎
B.肺吸虫病
C.流行性斑疹伤寒
D.流行性出血热
E.疟疾
参考答案:B
解析:人不易作为传染源的疾病是肺吸虫病。
从方框中选择合适的句子补全对话。
Students:Good afternoon, Miss Jiang.
Teacher:小题1: Today, we’ll talk about a new bird flu. It has hit some Chinese cities.
小题1:
Monitor:小题2:
小题2:
Teacher:Yes, it is. It’s reported that about 35 people have been ill.
Monitor: 小题3: .
小题3:
Teacher:We should keep away from animals. And we should wash our hands correctly.
Monitor: 小题4:
小题4:
Teacher:It should take at least 20 seconds each time. 小题5: See a doctor at once if you have a high fever or have trouble breathing.
小题5:
纽芬兰岛等地的鳕鱼,因被过度捕捞而数量急剧下降。科学家发现,对鳕鱼的过度捕捞改变了鳕鱼的进化过程,导致了鳕鱼的早熟,使其形体变小、品质降低。鳕鱼“被早熟”体现了( )
①规律是客观的,不可违背 ②发展是新事物代替旧事物
③人为事物的联系是主观的 ④量变是质变的前提和基础
A.①②
B.②④
C.①④
D.③④