制样室应宽大敞亮，不受风雨和外来灰尘的影响，要有（）设备。
A.制冷设备
B、通风设备
C、除尘设备
参考答案：C
—Shi Changxu was awarded a special state prize for his scientific research．
—He certainly _____ that honor, for he has devoted so much to the country．
A．expects
B．deserves
C．observes
D．respects
天然森林很少发生松毛虫害，近几年来，某人工马尾松林常发生严重松毛虫害，其主要原因是（）
A.人工林内松毛虫繁殖能力强
B.人工林成分单一，营养结构简单
C.马尾松适应性差
D.该地区气侯适宜于松毛虫生长
