When anaerobic bacteria convert the sewage to an inert sludg

【名词&注释】

直升机(helicopter)

[单选题]When anaerobic bacteria convert the sewage to an inert sludge, .

A. no oxygen is needed
B. oxygen is necessary
C. oxygen is given off
D. no gas is produced

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举一反三：

[单选题]直升机救助的最大的特点是:

A. 救助距离远
B. 救助大量人员
C. 救助行动迅速

[单选题]They went on ________ as usual

A. work
B. worked
C. works
D. working

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