单项选择题

“To overcome these barriers, collaboration between research institutions, industry, government, and other stakeholders is essential.” In this sentence, the underlined phrases indicate:

A．the reviewed focus
B．what is needed to be done in the future
C．the reviewed problem
D．the review’s significance

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多项选择题

西餐厅服务人员,男士的发式因遵循的原则有（）
A.

前不附额
B.

侧不掩耳
C.

后不及领
D.

前可盖眉
E.

其余都有

单项选择题

通常产生雷暴、阵雨，有时伴有阵性大风、偶有降冰雹的云为
A、Ns
B、As
C、Cb
D、St