The knife and fork are discharged into the tray， indicating that the dish has been eaten and can be withdrawn.。

Vigorous means using a lot of energy and strength or de...

单项选择题Vigorous means using a lot of energy and strength or determination.。

It’s a BAD idea to take that FLU shot every fall.。 A.正确...

单项选择题It’s a BAD idea to take that FLU shot every fall.。

A 20-minute walk can help you reap the benefits of regu...

单项选择题A 20-minute walk can help you reap the benefits of regular exercise， and it may help improve your cold symptoms as well.。