不久前“绿领巾”“差生教室外考试”“测智商”等事件，引起了社会各界的强烈关注。这

铸坯的表面缺陷主要决定于钢水在二冷段的凝固过程。

Few people seem to care about what a super star _____ before he/she became famous.

A．goes through 　

B．is going through

C．have gone through

D．had gone through

燃烧必须具备如下条件：(1)有可燃物质；(2)有助燃物质；(3)氧气。

Accumulations of oily rags should be（）.

A.kept in nonmetal containers

B.discarded as soon as possible

C.cleaned thoroughly for reuse

D.kept in the paint locker

SG1025／18.3—M316型锅炉燃烧器采用（）布置，使用（）燃烧方式。燃烧室四角共布置（）只燃烧器，除煤粉燃烧器外，其中还布置有（）只重油枪。在每只重油枪的侧面，还配有（）只轻油点火器，其点火方式为（）。