White smoke __________25～30 meters above the hill as they approached it.

A． has been seen rise

B． had been seen rising

C． was seen rise

D． was seen rising

[单选题]White smoke exhausting from an operating diesel engine may indicate （）.A . a cracked linerB . burning lube oilC . an overloaded engineD . insufficient combustion air

White smoke from a boiler may indicate _.A. low fuel oil temperatureB. low fuel

White smoke from a boiler may indicate _______.A. a fractured tubeB. low fuel oi

Some of the bridges are more than 30 meters long and can support the weight of 5

White _____ at 8:30 for the meeting, but he didn’t show up.A. should have arrive

[单选题]The ship has（）of more than 10 meters at full load.A . an engineB . an overall lengthC . a displacementD . a draft

[判断题] 在Linear栏中应选Meters。A . 正确B . 错误

The card above is ______ .阅读理解(本大题共 15 小题,共 30.0 分)A1. The card above is

[单选题]A．ll the stories above .A．were collected by Anderson B.are read by kids onlyC．were written by the brothers Grimm D.are listed by date added

[单选题]______ is white.A.A bird's colorB.Bird's colorC.The bird's colorD.Bird colo