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小博士：细心的同学们肯定发现了有些名词有单数(singular)和复数(plural)两种形式，而有些名词只有单数形式，这是怎么回事呢？让我来告诉你吧。英语中，名词按其所表示的事物的性质，可分为可数名词(countable noun)和不可数名词(uncountable noun)，可数名词有复数形式，不可数名词一般没有复数形式。名词单数变复数的变化规则见下表。
比一比，看谁写的单词多！
1 直接加-s的单词有：________________________________.
2 加-es的单词有：___________________________________.
3 变y为i再加-es的单词有：__________________________.
4 不规则变化的单词有：_______________________________.
查看习题详情和答案>>（1）炭疽杆菌感染人体后，其产生的毒素能刺激体内产生__________，将其消灭，这种物质的化学本质是__________，这种免疫方式属于____________免疫。
（2） 当毒性极强的炭疽芽孢杆菌第一次进入人体之后作为
起作用，使其体内产生了具有免疫力的物质，与该物质产生有关
的细胞有吞噬细胞、____________、_____________和__________。
（3） 若多种病原体进入体内都能直接被吞噬细胞吞噬而消灭，这属于___________免疫。有些毒性很强的病原体经过上述过程不能被清除，只是将其__________________暴露出来，呈递给记忆细胞，使之迅速增殖分化为效应B细胞或效应T细胞，如果病原体是胞内寄生菌，则要通过_____________免疫的方式才能将其消灭。记忆细胞对抗原的记忆、识别和免疫等是依赖于细胞膜上的_______________实现的。
（4） 若病毒等侵入T细胞并使之大量死亡，使人丧失免疫功能，导致各种传染病的发生，这属于获得性________________病。 查看习题详情和答案>>
小博士：仔细观察下面的句子，你会发现动词“like”有两种不同形式，找找看，它们的用法有什么不同呢？
试着填好下面的表格。
查看习题详情和答案>>
选择适当的词(组)并用其适当形式完成短文。每个词(组)只使用一次，其中有两个是多余的。
A father was really worried about his son, who was sixteen years old but had no 1 at all．So the father decided to call on a monk(修道士)to train 2 child．
The monk said to the boy's father,“You should leave your son alone here, I'll make him into a 3 man within three months．However, you can't come to see him during this period．”
Three months 4 , the boy's father came．The monk arranged a box match 5 the child and an experienced boxer．Each time the fighter struck the boy, he fell down, but 6 the boy stood up, and each time he was knocked down again, then the boy stood up again．After several times, the monk asked,“What do you think of your child?”
“ 7 a shame(羞愧)!”the boy's father said．“I never thought he would be so easily knocked down．I needn't have him 8 here any longer．”
“I am sorry 9 that's all you see．Don't you see that each time he falls down, he stands up again instead of 10 ?That's the kind of courage you wanted him to have．”
用所给词的适当形式填空，有两个是多余的。
Mr．Knott was a teacher．He 1 in a big school in London．
He 2 a long way from the school．So he was usually quite 3 when he got home．At nine o’clock one evening, when he was in bed, the telephone bell 4 in the hall of his house, so he went downstairs, picked up the telephone and said, “This is White Bridge 3165．Who’s 5 , please?
“Watt,” a man answered．
“What’s your name, please?” asked Mr．Knott．
“Watt’s my name．”
“Yes, I 6 you that．What’s your name?” Mr．Knott said again．
“I told you, Watt is my name,” 7 the other man．“ 8 you Jack Smith?”
“No, I’m Knott,” answered Mr．Knott．
“Will you give me your name, please?” said Mr．Watt．
“Will Knott,” answered Mr．Knott．
Both Mr．Watt and Mr．Knott 9 their telephone down 10 and thought, “That is a rude, stupid man．”