According to the author, examples such as Rillieux and McCoy___________
A. implied that black people are all talented
B. encouraged more blacks to make inventions
C. spurred the economic development at their times
D. proved Negroes' great talent in invention
查看答案
Which of the following is NOT mentioned as a possible cause of a tradeimbalance？
A. Low labor and material costs in Asiancountries.
B. A lack of natural resources
C. An underdeveloped industrial base.
D. The high cost of exported items.
A. Content of speech is more important than tone of voice.B. Voice quality has a strong ef
A. Content of speech is more important than tone of voice.
B. Voice quality has a strong effect on listeners.
C. Effective speakers must use visual aids.
D. A microphone is essential in large rooms.
A. The woman enjoyed the movie very much.B. The man asked the woman to be careful at night
A. The woman enjoyed the movie very much.
B. The man asked the woman to be careful at night.
C. The woman saw a horror movie.
D. The man went to the movie with the woman.
根据下列材料，请回答：
A. Studying.
B. Preparing snacks.
C. Playing cards.
D. Learning how to play bridge.
微信支付 
支付宝支付