What does the survey indicate？
A. Many poor Americans want large portions,
B. Twenty percent Americans want smaller portions.
C. Fifty seven percent Americans earn $150,000 per year.
D. Twenty three percent Americas earn less than $ 25,000 per year.
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2kW的异步电动机，运行于相电压为220V的三相电路，已知电动机效率为81%，功率因数为0.82．则这台电动机的额定电流为()。
A. 5
B. 7
C. 9
D. 9.8
The Coriolis force causes all moving projectiles on Earth to be deflected from a straight
A. spring
B. deviate
C. be retracted
D. be conceived
what can be inferred from the passage？
A. Even an educated person can not read old English without special training.
B. A person who knows French well can understand old English.
C. An educated person can understand old English but can not pronounce it.
D. A person can pronounce old English words but can't understand them.
Which of the following statements is true according to the book A Teen's Guide to Going Vegetarian？
A. Some of the highest pesticide residues appear in meat and eggs.
B. A meatless diet does not provide enough nutrients.
C. Protein can be found in almost every food.
D. More than 80% of the corn in the U.S. are fed to livestock.
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