单选题I didn"t mind their coming late to the lecture, but I objected their making so much noise .

单选题______ he realized it was too late to return home. A. No sooner it grew dark when B. It was not until dark that C. Scarcely it grew dark than D. While it grew dark that

单选题We decided to leave the waitress a big __________ because her service was excellent.

单选题—Go for hiking this Saturday, OK? — ______ . I like getting close to nature.

单选题The mayor of the town is a _______ old man.

单选题Scientists say that many factors ______ changes in the weather. A. bring in B. bring off C. bring about D. bring forward

单选题I miss the hillside ___________ we found a lot of wild flowers.

单选题At first the institute refused to purchase the telescope, but this decision was ______ revised.

单选题He is now accustomed to ______ early.

单选题Having worked as a (n) ______ professor for five years, he is considering becoming a full professor. A. vice B. secondary C. associate D. deputy

单选题Headphones used with MP3 digital music players like the iPod may interfere with heart pacemakers(起搏器) and implantable defibrillators(除颤器), U. S. researchers said. The MP3 players themselves posed no threat to pacemakers and defibrillators, used to normalize heart rhythm. But strong little magnets inside the headphones can confuse the devices if placed within 1. 2 inches of them, the researchers told an American Heart Association meeting in New Orleans. Dr. William Maisel of the Medical Device Safety Institute in Boston led a team that tested eight models of MP3 player headphones in 60 defibrillator and pacemaker patients. They placed the headphones on the patients' chests, directly over the devices. The headphones interfered with the heart devices in about a quarter of the patients--14 of the 60--and interference was twice as likely in those with a defibrillator than with a pacemaker. Another study presented at the meeting showed that cell phones equipped with wireless technology are unlikely to interfere with pacemakers. A pacemaker sends electrical impulses to the heart to speed up or slow heart rhythm. The magnet, however, could make it deliver a signal no matter what the heart rate is, the researchers said. An implantable defibrillator signals the heart to normalize its rhythm if it gets too fast or slow. A magnet could de-activate it, making it ignore an abnormal heart rhythm instead of delivering an electrical shock to normalize it. The devices usually go back to working the right way after the headphones are removed, the researchers said. "The main message here is: it's fine for patients to use their headphones normally, meaning they can listen to music and keep the headphones in their ears. But what they should not do is put the headphones near their device," Maisel said in a telephone interview. So that means people with pacemakers or defibrillators should not place the headphones in a shirt pocket or coat pocket near the chest when they are not being used, and should not place them over their chest or have others who are wearing headphones rest their head on the patient's chest, Maisel said.

单选题Nowadays, children often prefer ______ TV to reading.

单选题He is a man who is always ______ fault with other people.

单选题—— What day is it today? —— __________ .

单选题Don't risk ______ the chance which so many people dream of.

单选题Man: I like this TV set a lot.______ Woman: It' s made in Germany.

单选题—How do you feel about taking the job in Los Angeles?— ______ ? It's the biggest company in the country.

单选题Would the news ______ he failed to pass the exam bother you?