单项选择题

Classified by different aims, there are at least 4 major types of test, among which ______ is to discover what the testee already knows about the target language.

A．aptitude test
B．proficiency test
C．achievement test
D．diagnostic test
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单项选择题
The word bird used to mean young bird ; today it means any kind of bird . This is called ______ in terms of semantic change.
A．broadening
B．narrowing
C．meaning shift
D．class shift
单项选择题
Which of the following is the characteristic of hydrogen
A．It is nontoxic.
B．It has lots of vapour.
C．It doesn’t produce damaging fuels.
D．It costs less.
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