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【单选题】
某反应A+2B═C+D，若有30gA和15gB恰好完全反应生成10gC，那么要得到7gD，参加反应A的质量应为（ ）A.
20g
B.
15g
C.
12g
D.
6g
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举一反三
【单选题】The lecture said “It is time ____________ you the literature review.”
A.
began
B.
should begin
C.
begin
D.
are beginning
【简答题】Review the text and fill in each blank with no more than four words . Einstein was once invited to give a lecture at a ____1______. He was ______2_____ that he wished not to give it, but he didn’t wan...
【多选题】Which of the following descriptions about Leizu are correct according to the lecture?
A.
Leizu was also called Xi Ling Shi.
B.
She was believed to be the empress of the Yellow Emperor.
C.
It is said that she had contributed greatly to the invention of sericulture.
D.
She was appointed by Chiyou as the leader in charge of fashioning of the garments.
【简答题】In this lecture, it is said that winter is the season of ________.
【单选题】Which of the following is not the correct information to describe Leizu according to the lecture?
A.
Leizu was also called Xi Lingshi.
B.
She was believed to be the empress of the Yellow Emperor.
C.
It is said that she had contributed greatly to the invention of sericulture.
D.
She was appointed by Chiyou as the leader in charge of fashioning of the garments.
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