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【单选题】
关于判断生物地球化学性疾病,不正确的是( )A.
疾病发生有明显的地区性
B.
与该地区某种化学元素之间关系密切
C.
疾病的发生与地质中某种化学元素之间有明显的剂量一反应关系
D.
疾病的发生在不同时间、地点、人群中有同样的相关性
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【单选题】根据下列文章,请回答 36～40 题。Where Ha ve All the Frogs Gone? In the 1980s, scientists around the world began to notice something strange: Frogs were disappearing. More recent research has shown that many kinds ...
A.
knowledge about fatal human diseases.
B.
knowledge about air and water pollution.
C.
A chance to discover new medicines.
D.
an opportunity to detect poisonous gases.
【简答题】It is difficult for us to learn a lesson in life __________ we’ve actually had that lesson. A．until B．after C．since D．when
【简答题】p ossibly occupy nowadays production afterwards vital everyday nonsense 1. Nobody can run a mile in two minutes. 2. It’s that you send that application form off by the twenty-third of this month. 3. T...
【单选题】It is difficult for us to learn a lesson in life __________ we've actually had that lesson. [ ]
A.
when
B.
after
C.
since
D.
until
【单选题】It is difficult for us to learn a lesson in life ______ we’ve actually had that lesson.
A.
until
B.
after
C.
since
D.
when
【单选题】I’ve already told you that the fourth and last part of the article ______ the most difficult to understand.
A.
is
B.
was
C.
are
D.
were
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