单项选择题
A．He will help the woman carry the suitcase. B．The woman’s watch is twenty minutes fast. C．The woman shouldn’t make such a big fuss. D．There is no need for the woman to be in a hurry.
A、allowing B、avoidable C、briefly D、component E、determined F、helping G、increasingly H、lowest I、maintain J、maximum K、prevent L、principle M、provoke N、seriously O、topic
A．They need to be further improved. B．They can easily switch to natural gas. C．They are more cost-effective than vehicles powered by solar energy. D．They can match conventional motor cars in performance and safety.