It is believed that if a book is（）,it

1、It is required that ships proceeding a

It is required that ships proceeding at sea should keep continuous watch on（）.AVHF channels 16 and 13BAppropriate DSC distress and safety frequenciesCINMARSAT TDM message channelDVHF channel 70 and channel 8

2、Why is it a problem if all the smaller

Why is it a problem if all the smaller fish species die?A Its not healthy for the environment.B People only like to catch big fish.C There are too many small fish.D The smaller fish can get lost in the lake.

3、It is a type of desert bush that can（）

It is a type of desert bush that can（）extremes of temperature.AadaptBwithdrawCwithstandDshade

4、It is reported that many a new house a

It is reported that many a new house at present in the disater area. ( )A are being builtB were being builtC was being builtD is being built

5、It is during （） that work energy is be

It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.Athe suction strokeBthe compression strokeCthe expansion strokeDthe exhaust stroke

6、A port is（）if the delay in leaving it

A port is（）if the delay in leaving it would be such as to frustrate the adventure．Anot goodBunsafeCsafeDobtainable