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【单选题】
How did Binet decide which tasks to include on his first test?A.
He first gave some of the tasks to different groups of children.
B.
He first gave the tasks to many children he thought appropriate.
C.
He first gave all the tasks to many children regardless of their age.
D.
He first worked out thirty tasks for mentally deficient children.
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【单选题】下列化合物中与四氢硼钠生成红色反应的是 ( )
A.
5 ，7，4’-三羟基黄酮
B.
5 ，7，4’-三羟基双氢黄酮
C.
3 ，5，7，4’-四羟基花色素
D.
4 ，2’，4’，6’-四羟基查耳酮
【简答题】下列常见的医用溶液中,溶剂不是水的是( ),常温下溶质是液体的是( ) 葡萄糖溶液,生理盐水,消毒酒精,碘酒
【简答题】阅读理解。 Have you ever heard of the story of Earth Day? Now let me tell you. Earth Day was started 111 1970 by a man named John McConnell from the United States. In the beginning, it was held on one day...
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【单选题】----- Have you heard of Earth Day ? ----Yes . The first Earth Day ______ in 1970 to educate us to protect our planet .
A.
celebrates
B.
celebrated
C.
is celebrated
D.
was celebrated
【单选题】下列化合物中与四氢硼钠生成红色反应的是( )。
A.
5,7,4′-三羟基二氢黄酮
B.
4,2′,4′,6′-四羟基查耳酮
C.
5,7,4′-三羟基黄酮
D.
3,5,7,4′-四羟基花色素
E.
7,8,4′-三羟基异黄酮
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