哪个字母代表“注册商标”?A. E B. R C. Z
( ) This boy ________ a bike to school. A. by B. ride C. rides
( ) There words have __________ “es”. A. a B. anC. one
( ) —__________ is the weather today? — It’s cool. A. HowB. What C. What’s
( ) —__________ are you from? —Beijing. A. DoB. What C. Where
( ) I always have my umbrella __________ a rainy day. A. in B. on C. at