皮皮学，免费搜题
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【单选题】
为了使客户端程序查询不同的信息资源时有统一的访问方法而定义的一种地址标识是 ( )。A.
URL
B.
HTML
C.
HTTP
D.
WWW
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】It is mentioned the passage that one has to pay tax according to _______ .
A.
how much education one has received
B.
whether one is single or married
C.
how old one’s children are
D.
where one lives
【单选题】On the basis of their observations, scientists
A.
make more observations.
B.
develop hypothesis and theories.
C.
reveal their observations to the public.
D.
challenge their colleagues.
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