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【单选题】
功能清热解毒、排脓,善治肺痈、肺热咳嗽的药物是:A.
．红藤
B.
白头翁
C.
鱼腥草
D.
．蒲公英
E.
射干
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【简答题】Today, bicycles are elegantly machines that are common around the world. Many people ride bicycles for recreation, whereas others use them as a means of transportation. The first bicycle was in...
【单选题】______ machines have multiplied over the centuries, even the most up-to-date list must begin with simple machines.
A.
While
B.
After
C.
As
D.
Since
【简答题】Inventions such as refrigerators and washing machines did much to _______ () home in the early 1900s.
【简答题】国际邮件按处理时限划分，可分为（）、（）、（）等几种。并在外表面注有专门标志。
【单选题】According to the text, simple machines can do the following but
A.
allow energy to be transferred from one place to another
B.
change the distance and speed of a moving object
C.
perform the task automatically
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