IMP是各种核苷酸形成中的共同前体物。

BEIJING—Chinese Premier Wen Jiabao has visited the "left-behind"(留守) children whose parents are working in cities before Children's Day.

During a visit to northwest China's Shanxi Province, Wen visited the home of Yang Saike, a primary school boy in a village of Xingping City. Yang, whose parents were working in Fujian, thousands of kilometers away, was cared for by his grandparents. His parents fail to go home even once a year. Wen talked with many children and asked them many questions about their schooling and life.

"You are so pretty," Wen said to Liu Mengqi, a seven-year-old girl living with her grandmother. Liu's parents were also working in the city.

"Have you been to school yet?" Wen asked two other girls.

"We are going to the pre-school class," said one.

"Mom and dad at home?" Wen asked. The children shook their heads.

"Children cannot see their parents very often, which is a new problem in the country-side. We should give them more care and love," said the premier.

The premier asked local governments to do something to protect and care for such children at home and freeing their parents in cities from worries about their children.

小题1:Wen says a new problem in the country is that "left-behind" children _________.

A．seldom get care from the government

B．seldom get together with their parents

C．cannot do well in school like others.

D．cannot get any love from their parents小题2:Wen Jiabao asks local governments_________.

A．to do more for "left-behind" children and their parents

B．to let the parents see their children only once a year

C．to stop the local people from going to work in cities

D．to build more schools for the "left-behind" children小题3:The proper title (标题) for this passage is "Give ________ more love".

A．poor children

B．disabled children

C．country children

D．'left-behind' children

李昌和王平的期终考试课程共五门。他俩的成绩除了历史课相同外，其他的都不同。他俩的各门考试都及格了，即每门成绩都在60～100分之间。

如果题干的断定都真，并且事实上李昌五门课的平均成绩高于王平，则以下哪项关于上述考试的断定一定为真？I．李昌的最低分高于王平的最高分。II．至少有四门课程，李昌的平均分高于王平的平均分。III．至少有一门课程，李昌的成绩分别高于王平各门课程的成绩。

A．只有I。

B．只有II。

C．只有III。

D．只有I和II。

女性，60岁。帕金森病史7年。间断服用安坦。近1个月病情加重，吞咽困难，言语含糊不清，四肢僵硬，卧床不起。

安坦对患者疗效不好的原因最有可能的是（）。

A.药物选择不合理

B.药物剂量不足

C.药物的毒副作用

D.出现并发症

E.吸烟与嗜酒

食物中长期缺乏维生素B1易引起（）

A、蛋白质热能营养不良

B、癞皮病

C、脚气病

D、败血病

脚手架立杆稳定性的计算公式为：N/ψA+Mw/W≤f其式中的各符号代表什么意思？