急性气管-支气管炎起病时常有（） A.上呼吸道感染的症状 B.湿啰音 C.X线胸片无

在Visual FoxPro中，释放表单时会引发的事件是（）。

A．UnLoad事件

B．Init事件

C．Load事件

D．Release事件

Stress for a teenager is as real a problem as stress for an adult. To deal with it, it’s important to understand the causes of stress in teenagers.

When parents change their jobs or if the family decides to move to a different place, the child has to change schools, find new friends, adapt to the new social circle and fit into new groups. It is always difficult for children to adapt to such changes, which can be a serious cause of stress in their life.

Academic difficulties, such as inability to understand a certain subject can cause stress. Not every child has the ability to understand every subject. Some kids need extra help besides school work to grasp a few concepts. Poor academic performance is often laughed at and is looked down upon by both teachers and peers. In such cases, it can make the child feel isolated, neglected and hurt. All of this, put together, can add to stress, which many times worsens grades.

Extra curricular activities (课外活动) such as playing a sport, or attending art classes can weigh heavily on your child’s mind. Juggling between school and extra curricular activities does seem like a burden when you have to excel at both. When the pressures from both the ends get unmanageable, teenagers tend to get tired and annoyed. Fatigue sets in, leading to stress related issues such as lack of concentration in school.

These are the common causes of stress in teenagers, which can be noticed through signs such as poor memory, anxiety, negative and pessimistic attitude. If the signs of teenage stress go unrecognized for a long time, it can make the child emotinally imbalanced.

小题1:Extra curricular activities may lead to additional pressure for teenagers when they have difficulty _________________________________________________________.

小题2:How can parents notice that their teenagers are under stress?

_________________________________________________________________.

小题3:____________________, ___________________, extra-curricular activities are the common causes of stress in teenagers.

小题4:According to your experience, what other causes of teenage stress do you know? (List two causes).

_________________________________________________________________.

2012年3月1日，A公司和B公司由于买卖关系，A公司签发一张20万元的于2012年5月1日付款的定期付款的甲银行承兑汇票。3月15日，B公司在和C公司购销合同中，将此汇票背书转让给C公司，并在汇票上记载"不得转让"字样。3月28日，C公司在和D公司的买卖合同中将其背书给D公司，同时C公司没有记载背书时间。5月5日，D公司向甲银行提示付款，但甲银行拒绝付款。

关于商业汇票，下列说法正确的是（）。

A.收款人享有付款请求权和追索权双重权利

B.出票人的出票行为并不意味着付款人因此而承担付款的义务

C.出票人的出票行为就意味着付款人因此而承担付款的义务

D.持票人依法请求付款时，而付款人不予付款，出票人就应该向持票人承担票据责

在近代史上，割占中国领土面积最大的列强是（）

A.英国

B.法国

C.俄国

D.美国

论述光照对三七生长发育的影响？