单项选择题
—How can I use this washing machine —Well, just refer to the().
A．explanations B．expressions C．introductions D．directions
单项选择题 Historically, () main material for making tables has been wood, but ()metal and stone have also been used.
单项选择题 Readers () can very smoothly without knowing the exact meaning of each word.
单项选择题 The sun was shining brightly, () everything there () more beautiful.
