单项选择题

协助老人侧卧位进食时应将床头抬高
A、20°
B、30°
C、40°
D、50°

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单项选择题

下面表示过渡效果速度曲线的取值中，可以表示匀速的是( )。

A、ease
B、linear
C、ease-in
D、ease-out

多项选择题

It was said that paper-cutting could be traced long brfore the paper was invented. People used ________ as materials to carve.
A、leaves
B、silver foil
C、silk
D、leather