What can cause the disasters of gap years?

［A］ Intervention of parents. ［B］ Careful planning. ［C］ Good health. ［D］ Realistic expectation.

[单选题]What is a cause for the change of Stefania’s body clock?A． Eating fewer meals.B． Having more hours of sleep.C． Lacking physical exercise.D． Getting no natural light.

[单选题]what might be the cause if the children’s sickness?A． the crops didin’t dowellB．there were too many insectsC．the visits brought in diseasesD．the pesticides were overused

[单选题]What is a cause for the change of Stefania’s body clock?A．Eating fewer hours of sleep.B．Having more hours of sleepC．Lacking physical exercise.D．Getting no natural light.

[单选题]Insufficient ______ can cause a processor to work at 50% or even more below its performance potential.A．mouseB．I/OC．documentD．MemoryA．B．C．D．

[单选题]What’s the cause of the crosswalk safety problem according to the test?A． There’re many cars and buses on the road.B． Pedestrians are careless.C． Crosswalks are crowded.D． Drivers don’t give way.

[单选题]What might be the cause of the children’s sickness?A． The crops didn’t do well.B． There were too many insects.C． The visitors brought in diseases.D． The pesticides were overused.

[单选题] Insufficient （71）can cause a processor to work at 50% or even more below itsperformance potential.（71）A． mouseB． I/OC． documentD． memory

[单选题]Insufficient(71)can cause a processor to work at 50% or even more below its performance potential.A．mouseB．I/OC．documentD．memory

[单选题]Which cause of the following can lead to the engine not to start on air?（）A . starting air pressure too highB . correct timing of starting air valvesC . three of the starting valves stuckD . the turning gear disengaged

[单选题]A． crack in a cylinder liner can be caused byA．worn piston ringsB．installation of undersized sealing ringsC．operating the engine at low loadsD．restricted cooling water passages