单项选择题

A．The trouble of melting coniine oxide.
B．The high price of it.
C．The difficulty of spraying it on the engine parts.
D．It being not environment-friendly.
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单项选择题
A．He is too busy with his job.B．He earns too little to have any form of recreation.C．He does not like it.D．He watches TV all night long.
A．He is too busy with his job.
B．He earns too little to have any form of recreation.
C．He does not like it.
D．He watches TV all night long.
单项选择题
A．Hiking or skiing in a snowy season.B．Playing chess.C．Listening to the music on the radio.D．Swimming in winter.
A．Hiking or skiing in a snowy season.
B．Playing chess.
C．Listening to the music on the radio.
D．Swimming in winter.
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