单选题In the eighteenth century, the town of Bennington, Vermont, was famous for________ pottery.

单选题Hardly anyone can put up with this sort of ______ living environments and all the hardships that he has to bear.

单选题The sense of mistrust is compounded by smaller annoyances that leave the families feeling as though no one in authority cares about them.

单选题To wake up, he sat up in the seat and turned to see who was making all the noise. A. Having woken up B. Waking up C. To have woken up D. Having to wake up

单选题When an organism is completely encapsulated and preserved, it becomes a fossil, therefore turning into evidence of things that once lived. A. thereby B. as a result of C. so D. in the end

单选题The author's purpose is to ______

单选题The discovery of the connection between aspirin and Reyes syndrome, a rare and deadly {{U}}ailment{{/U}}, is a recent example of the caution with which drugs must be used, even for medical purposes.

单选题We don't plan to go to the concert, and so they don't. A. so do they B. they don't too C. neither don't they D. they don't either

单选题The first recorded use of natural gas to light street lamps {{U}}it was{{/U}} in the town of Frederick, New York, in 1825.

单选题The "Karat" marking on jewelry tells you what proportion of gold is mixed with other metals. If 14 parts of gold are mixed with 10 parts of base metal, the combination is called 14 Karat (14K) gold. The higher the Karat rating, the higher the proportion of gold in the object. The lowest Karat gold that can be marketed in the United States is 10-Karat gold. Jewelry does not have to be marked with its Karat quality, but most of it is. If there is a Karat quality mark, next to it must be the U.S. registered trademark of the person or company that will stand behind the mark, as required by the National Gold and Silver Stamping Act.

单选题Having finished lunch, the case was discussed. A. they discussed the case B. they had discussed the case C. the case was discussed D. the case had been discussed

单选题The normal human daily cycle of activity is of some 7-8 hours" sleep 1 with some 16-17 hours" wakefulness and that the sleep normally coincides 2 the hours of darkness. Our present 3 is with how easily and to what extent this 4 can be modified. The question is no mere academic one. The ease with 5 people can change from working in the day to working at night is a 6 of growing importance in industry where automation 7 round—the-clock working of machines. It normally 8 from five days to one week for a person to adapt to a 9 routine of sleep and wakefulness, sleeping 10 the day and working at night. 11 it is often the case in industry that shifts are changed every week. This 12 that no sooner has he got used to one routine 13 he has to change to another, 14 much of his time is spent neither working nor sleeping very 15 . One answer would seem to be 16 periods on each shift, a month, or even three months. 17 , recent research has shown that people on such systems will revert to go back to their 18 habits of sleep and wakefulness during the week-end and that this is quite enough to destroy any 19 to night work built up during the week. The only real solution appears to be to hand over the night shift to those permanent night workers whose 20 may persist through all weekends and holidays.

单选题John and I have just been telling stories {{U}}two of us{{/U}}.

单选题This selection leads one to believe that the Earth ______.

单选题________into oceans and rivers is a serious form of pollution.

单选题The professor is quite difficult {{U}}pleased{{/U}}.

单选题Some of the low-end made-in-China mechanical-electronic products are not selling well in export market as compared with what are termed as high-end ones.

单选题Readers are required to abide by the rules of the library and mind their manners.

单选题One {{U}}who{{/U}} desires and impulses are not his own has no character.

单选题Mathematics as well as physics always______me a lot of trouble.