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【简答题】
It's not just that I've been illness-free, it's that I feel ___v___ and __s____. 我不但不生病,而且精力充沛,情绪饱满。
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【简答题】What changes do vaccines acctually make to people?
【简答题】Vaccines against pneumonia do not provide protection against 2019-nCoV.
【多选题】关于html 5中属性是否可以省略属性值,说法正确的有?
A.
所有属性都可以省略属性值
B.
只有boolean属性可以省略属性值
C.
当在元素中使用了boolean属性且省略属性值，相当于该boolean属性的属性值为true
D.
当在元素中使用了boolean属性且省略属性值，相当于将该boolean属性的值设为空值("")
E.
当在元素中没有使用boolean属性，相当于该boolean属性的属性值为false
【单选题】How do vaccines protect humans from diseases according to paragraph 2?
A.
By training the immune system to fight weaker versions of the disease.
B.
By passing information on how to fight the disease to the immune system.
C.
By weakening the disease so that the immune system can defeat it.
D.
Introducing the disease to the body, so that survivors have already fought it.
【单选题】在HTML5中,大多数元素都支持隐藏属性,下面哪个属性可以将元素隐藏。
A.
contenteditable属性
B.
spellcheck属性
C.
hidden属性
D.
draggable属性
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