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【判断题】
柠檬酸钠的机理是除去了血浆中的血酶。A.
正确
B.
错误
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【简答题】People of ancient Egypt and Europeans of the Middle Ages ．
【单选题】People living in the desert choose to keep their ancient lifestyles and customs, _______people in cities throw away their cultural traditions.
A.
when
B.
if
C.
unless
D.
while
【简答题】阅读理解。 How did ancient people tell time? ◇Natural ways of keeping time In ancient time, people had to use the sun and the moon to tell time. They got up when the sun came up and worked in the fields un...
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