【单选题】______ several hypotheses have been advanced for the disappearance of the dinosaur, no conclusive evidence supports any of them.
【单选题】The best title for the passage would be ______.
A.
Hypotheses and Theories
B.
On Distinguishing Fact from Fiction
C.
The Nature of Science and Scientists
D.
Biology and the Scientific Age
【判断题】分析化学是研究物质的化学组成的分析方法及有关理论的一门学科。
【简答题】(P29) 不健康的生活方式是引起多种 ( ) 的最主要原因。
【单选题】请选择 不能 填 入( ) 内的 单词 。 미선 씨가 ( )
【多选题】The hypotheses of Macroeconomics are:
A.
Market mechanisms are perfect
B.
Market mechanisms are imperfect
C.
The government has the ability and authority to regulate the economy
D.
The government do not regulate the economy, let it free
【单选题】Scientists' hypotheses are guesses which are already supported by a certain amount of evidence, derived from actual observation and experiment.