The Segway is a vehicle______.A．that is expensive to useB．that is environment－friendlyC．de

There is a demand in Congress for vehicles with higher fuel economy because ______.A．the c

The word "they" in line 9 refers to ______.A．childrenB．AmericansC．booksD．vehicles

The word "traffic" （Para. 3) probably means"______".A．all the vehicles moving along a road

The competition vehicles______.A．all look the sameB．are used for plowing fieldsC．are trans

Soon after the accident happened, the vehicles involved were ______ away.A．jerkedB．towedC．

She managed to scramble（爬)out of the vehicle as it burst into _____.A. flamesB. fuels