We may conclude from reading the passage that （）
A. a hovercraft can not fly high because of the surrounding high-pressure air
B. a hovercraft is as much in use as a plane
C. a hovercraft "flies" with a greater speed than ships
D. a hovercraft also has the problem of wave resistance
查看答案
某公路山岭隧道，长度为2000m；穿越的岩层主要是坚硬岩，岩体较完整，块状或厚层状结构；采用新奥法钻爆施工。两洞口处由于岩层较破碎设有明洞，进口明洞长10m，出口明洞长8m；两洞门采用端墙式洞门。 根据此案例场景，回答下列问题： 该隧道的围岩分级主要是( )。
A. Ⅱ
B. Ⅲ
C. Ⅳ
D. Ⅴ
Bush fires travel （）
A. in small way
B. in disorder
C. seriously
D. swiftly
"No One’s Gong to Change Our World" was （）
A. a record calling on people to conserve nature
B. a rule worked out by the United Nations
C. an important book published in 1970
D. an idea that nobody would accept
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