单项选择题

（）they will produce cars next years or not hasn't been made clear.

A.Whether
B.That
C.If
D.What

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单项选择题

（）much of their land is poor and only twelve percent of the land can be cultivated, over eighty percent of the population are agricultural workers.

A、Except that
B、Although
C、Because
D、So far as

单项选择题

Henning made the experiment in order to study（）

A、how students remember English vocabulary by short-term memory
B、how students learn English vocabulary
C、how to develop students’ ability in English
D、how long information in short-term memory is kept