单选题11. He finally succeeded in carrying out his plan owing to his hard-working.

单选题3. Her speciality is heart surgery.

单选题12. The last few weeks have been enjoyable.

单选题1. He denies involvement with either drugs or the CIA.

单选题. Iron Deficiencies Sports medicine experts have observed for years that endurance athletes, particularly females, frequently have iron deficiencies. Now a new study by a team of Purdue University researchers suggests that even moderate exercise may lead to reduced iron in the blood of women. "We found that women who were normally inactive and then started a program of moderate exercise showed evidence of iron loss," says Roseanne M. Lyle, associate professor at Purdue. Her study of 62 formerly inactive women who began exercising three times a week for six months was published in the journal Medicine Science in Sports Exercise. "Women who consumed additional meat or took iron supplements were able to bounce back," she notes. "But the new exercisers who followed their normal diet showed a significant decrease in iron levels." Iron deficiency is very common among women in general, affecting one in four female teenagers and one in five women aged 18 to 45, respectively. But the ratio is even greater among active women, affecting up to 80 percent of female endurance athletes. This means, Lyle says, that "too many women ignore the amount of iron they take in". Women of childbearing age are at greatest risk, since their monthly bleeding is a major source of iron loss. Plus, many health-conscious women increase their risk by rejecting red meat, which contains the most easily absorbed form of iron. And because women often restrict their diet in an effort to control weight, they may not consume enough iron-rich food, and are liable to experience a deficiency. "The average woman takes in only two thirds of the recommended daily allowance for iron," notes another expert. "For a woman who already has a poor iron status, any additional iron loss from exercise may be enough to tip her over the edge into a more serious deficiency," notes the expert. Exercise can result in iron loss through a variety of mechanisms. Some iron is lost in sweat, and, for unknown reasons, intense endurance exercise is sometimes associated with bleeding of the digestive system. The best sources of iron, and the only sources of the form of iron most readily absorbed by the body, are meat, chicken, and fish. Good sources of other forms of iron include dates, beans, and some leafy green vegetables.1. According to experts, who will possibly have iron deficiencies?

单选题2. The meaning is still obscure.

单选题 Where Have All the Bees Gone

单选题4. Her mood can be gauged by her reaction to the most trivial of incidents.

单选题1. Do not waste time on insignificant points.

单选题3. The parents always restrain their daughter from swimming in the nearby pool.

单选题3. She can be relied on in a crisis.

单选题 At the age of 30

单选题12. We consume a lot more than we are able to produce.

单选题5. His sole motive was to make her happy.

单选题10. I feel regret about what's happened.

单选题 A Great Quake Coming

单选题13. Don't irritate her. she's on a short fuse today.

单选题1. We are going to have the TV fixed.

单选题 Florida Hit by Cold Air Mass In January, 2003

单选题7. The conclusion can be deduced from the premises.