题干

某医院对新生儿感染的细菌进行了耐药性实验,结果显示70%的致病菌具有耐药性.下列有关叙述正确的是(    )

A:孕妇食用了残留抗生素的食品,导致其体内大多数细菌突变

B:即使孕妇和新生儿未接触过抗生素,感染的细菌也有可能是耐药菌

C:新生儿体内缺少免疫球蛋白,增加了致病菌的耐药性

D:新生儿出生时没有及时接种疫苗,导致耐药菌形成

上一题 下一题 0.0难度 选择题 更新时间:2017-03-15 05:14:20

答案(点此获取答案解析)

B

同类题3

任务型阅读

    Does your mood change with the seasons?

    Some people find that when the temperature goes down, so do their spirits.____They eat more and gain weight. They have trouble sleeping. They can't think clearly. Here are some ways you can beat the winter blues:

    Get out in the sun. Some experts say that winter blues happen because we get less sunlight in the winter than we do in other seasons. Some say that the decrease in sunlight can make us feel sad____

    Get some exercise. A walk or other exercise will make chemicals called endorphins (内啡肽)flow through your body. Endorphins are natural “feel good” chemicals.

    ____ Avoid having too much sugar. If you crave sugary foods (like cookies or candy), it may be a sign that you need more protein (蛋白质), like meat, chicken, or fish.

    Avoid holiday stress. Cut back if you have too many things to do. Make sure you have some quiet time to yourself____ Get some rest. Studies show that most teens need about nine hours of sleep each night. The average teen, though, gets only about six or seven hours of sleep per night.

    Get help. Be cautious if you feel sad all the time and the feeling won't go away.____Talk to an adult who you trust or get help from a doctor.

A. Eat more healthful foods.

B. Choose different foods in season.

C. Don't be so busy that you get run-down.

D. Those people sometimes feel sad for no reason.

E. You may have a bigger problem than the winter blues.

F. Getting extra sunlight each day can help brighten your mood.

G. A regular pattern of sleep is the most important thing to maintain.