单项选择题

One of them threatened me with a knife（）the other bound and gagged me.

A.if
B.although
C.while

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单项选择题

Among the following research methods，which one is cheaper and easier？（）

A.Opinion-based research method.
B.Quantitative research method.
C.Observational research method.
D.Experimental research method.

单项选择题

Suppose that 50 ice cream cones are demanded at a particular price.If the price of ice cream cones rises from that price by 4 percent，the number of ice cream cones demanded falls to 46.Using the midpoint approach to calculate the price elasticity of demand，it follows that the（）

A.demand for ice cream cones in this price range is elastic.
B.demand for ice cream cones in this price range is inelastic.
C.demand for ice cream cones in this price range is unit elastic.
D.price elasticity of demand for ice cream cones in this price range is 0.

判断题

Phonology studies the description and classification of speech sounds.（）

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