如图所示，理想变压器的原副线圈匝数比，副线圈与阻值为R=200的电阻相连，原线圈两端所加的电压，则
English is widely _______ throughout the world．（ ）
speak
speaking
spoken
to speak
Where is your mother， Tom？
She ______ the flowers in the garden．（ ）
waters
is watering
watered
has watered
Must I stay here？
No， you______． You may go home．（ ）
mustn't
have to
needn't
shouldn't
Since you are _______ danger，why not ask______ help？（ ）
in； for
in； to
with； for
with； to
What's your favorite film？
The Martin． It______ shows a lot of imagination，_______ has a sense of humor．（ ）
too； to
neither； nor
either； or
not only； but also
，副线圈与阻值为R=200
的电阻相连，原线圈两端所加的电压
，则
，副线圈与阻值为R=200的电阻相连，原线圈两端所加的电压，则
粤公网安备 44130202000953号