单项选择题

To read Tolstoy and ______ to nineteenth century Russian literature are two excellent reasons for taking Professor Morrel's Course.

A．to introduce
B．introduce
C．being introduced
D．to be introduced
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单项选择题
The steam engine gives us an example of heat ______ into work.
A．turns
B．turned
C．turning
D．being turned
单项选择题
A Russian-made rocket ______ a US telecommunications satellite ______ successfully ______ on Thursday.
A．carrying; is; launched
B．carrying; was; launched
C．carried; has; launched
D．carried; has been; launched
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