单项选择题

Which category of tests assumes that, in an efficient market, securities lie on the security market line（）

A. Event studies.
B. Cross-sectional tests.
C. Time-series tests.

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单项选择题

An investor sold a stock short and is worried about rising prices. To protect himself from rising prices he would place a:（）

A. stop order to sell.
B. limit order to sell.
C. stop order to buy.

单项选择题

Tests of trading rules based on available market data are tests of which form of the efficient markets hypothesis (EMH)（）

A. Strong-form.
B. Semistrong-form.
C. Weak-form.

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