留取中段尿必须在____________时进行，留取尿量_____________m

下列对甲～丁图的生命活动或生物现象变化曲线的叙述，错误的是

A．甲图Ⅱ和Ⅰ相比较，酶促反应速率慢，是因为温度低，酶活性降低

B．乙图中，影响曲线AB段的主要因素是温度

C．丙图可表示酵母菌在恒定容积的培养液中无氧呼吸积累的酒精浓度随时间的变化曲线

D．丁图中，曲线BC段的生理效应是随着生长素浓度增大，促进作用减弱

男，30岁。饥饿性上腹痛2年，进食后可缓解。胃镜检查：十二指肠溃疡愈合期，快速尿素酶试验阳性。最有效的治疗方案是（）

A.奥美拉唑+枸橼酸铋钾+克拉霉素

B.法莫替丁+阿莫西林+克拉霉素

C.西咪替丁+克拉霉素+左氧氟沙星

D.奥美拉唑+硫糖铝

E.奥美拉唑+阿莫西林+替硝唑

Bad teeth may be painful and it’s getting worse without treatment. They can even ruin your life. Illness of the teeth can find its way into the blood system. This can increase the chances of a heart disease or other illnesses.

Experts say good care for teeth should start at birth. Mothers’ milk is the best food for the healthy development of teeth.

But dentists say a baby’s mouth and early teeth should be cleaned after each feeding. Use a cloth with a little warm water. Do the same if a baby is fed with a bottle. Experts say if you decide to put your baby to sleep with a bottle, give him only water.

When baby’s teeth begin to appear, you can clean them with a wet toothbrush. Dentists say it is important to find soft toothbrushes made especially for babies and to use them very gently. Young children often eat toothpaste (牙膏) when they brush, so they should be carefully watched when they brush their teeth.

Parents often ask what effect thumb sucking (咬手指) might have on their baby’s teeth. Experts generally agree that this is fine early in life. Most children stop sucking their thumbs by the age of four. If it continues, parents should talk to their children’s dentist or doctor.

Dentists say children should have their first dental visit by the time they are one year old. They say babies should be examined when their first teeth appear usually at around six months.

小题1:Why should people pay attention to teeth problems?

A．They can cause other illnesses.

B．They will bring bad luck.

C．They will bring the family much trouble.

D．They usually last a long time.小题2: According to the writer, baby’s teeth should be protected from the day ______.

A．he begins to speak

B．he has his first tooth

C．he was born

D．he is fed with bottle milk小题3:The underlined word “it” in Paragraph 5 refers to “_____”.

A．toothache

B．parents’ trouble

C．thumb sucking

D．experts’ advice

下列关于化学反应的熵变的叙述中，正确的是

A．化学反应的熵变与反应的方向无关

B．化学反应的熵变直接决定了反应的方向

C．熵变为正的反应都是混乱度增大的反应

D．能自发进行的反应熵变一定都为正

政府指导价是指

A．由经营者自主制定，通过市场竞争形成的价格
B．由政府价格主管部门或者其他有关部门按照定价权限和范围规定基准价及其浮动幅度，指导经营者制定的价格
C．山政府价格主管部门按照定价权限和范围规定基准价及其浮动幅度，指导经营者制定的价格
D．由政府价格主管部门或者其他有关部门按照定价权限和范围制定的价格
E．由政府价格主管部门按照定价权限和范围制定的价格