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【单选题】
目前我国居民的主要死亡原因是心脑血管疾病、恶性肿瘤、慢性呼吸道疾病等慢性非传染性疾病,对于这类疾病应采取的预防措施是 (1分)A.
第一级预防
B.
第二级预防
C.
第三级预防
D.
第一级预防和第二级预防相结合
E.
第二级预防与第三级预防相结合
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【单选题】According to Paragraph 6, what error had Ames made at first?
A.
He thought only man-made chemicals dangerous.
B.
He suspected his experiments and tests.
C.
He is sometimes naive and ignorant.
D.
He considered most natural substances negativ
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A.
left
B.
to leave
C.
leaving
D.
having left
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【单选题】According to Paragraph 6, what error had Ames made at first?
A.
He thought only man-made chemicals dangerous.
B.
He suspected his experiments and tests.
C.
He is sometimes naive and ignorant.
D.
He considered most natural substances negative.
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