甲状旁腺素的主要功能在于升高血钙和降低血磷，其发挥作用的靶器官主要是A．骨，肾小管和

《关于切实做好被征地农民社会保障工作有关问题的通知》规定，各市县征地统一年产值标准和区片综合地价公布实施后，被征地农民社会保障所需资金的个人缴费部分，可以从其所得的土地补偿费、安置补助费中直接缴纳。( )

Studying volcanoes is a demanding profession. Hazel Rymer frequently has to struggle through rainforests, climb to the top of mountains, then climb 200 metres into the crater of active volcanoes. But the 38-year-old volcanologist does her best to make it sound less alarming than it is. “Driving to work is more risky,” she insists. “And the deepest I go into the crater of a volcano is about 300 metres,” she adds, trying to make it all sound as ordinary as taking the dog for a walk.

Hazel has been studying volcanoes for a long time, so it’s not surprising she is used to the danger. Her interest in volcanoes began at school. A teacher gave her a book about Pompeii. “I remember reading about the eruption of Vesuvius and the destruction of the city,” she explains. “The thought of all those people just frozen in time had quite an effect on me and I am still excited by their dangerous beauty today.”

Nowadays, volcanoes are getting more and more unpredictable. There have been many changes in sea level caused by global warming and melting ice caps. These have resulted in some dormant volcanoes erupting, so studying them is more dangerous than ever before. Hazel says that although she doesn’t take any unnecessary risk she has had some frightening moments. Her worst experience was on the slopes of Mount Etna in Sicily, when she was slowly surrounded by lava. “I had a choice of walking ten hours to get around the lava flow or just walking across it,” she explains. She chose to pick a path across the cooler rocks in the lava stream. “I guess it was five metres. The flow was 1,000°C, so if you hesitated your boots would begin to melt. It was scary, but it really was a practical decision --- there wasn't time to do anything else.”

And what about the future? “I haven’t been to the volcanoes in Indonesia yet. And I would love to spend some time working in the Antarctic,” she says. “I would also like to know why quiet lava flows erupt from some volcanoes and why other volcanoes go bang.” In other words, Hazel Rymer won’t be exchanging her volcanoes for the relative safety of driving to work just yet.

小题1:Hazel’s claim that “driving to work is more risky” than exploring volcanoes shows that ______.

A．people have exaggerated the dangers of volcanoes in the past

B．Hazel does not really understand the dangerous situations she puts herself in.

C．there are many bad drivers in the place where Hazel lives

D．Hazel is being modest and understating the dangers she faces小题2:When did Hazel first become interested in volcanoes?

A．When she was visiting Italy.

B．When she was at school.

C．When she was twenty.

D．When she saw Vesuvius.小题3:The underlined word “these” (in paragraph 3) refers to __________.

A．melting ice-caps

B．volcanic eruptions

C．changes in sea level

D．higher temperatures小题4:When Hazel was on Mount Etna she had to ________.

A．take a dangerous route

B．take an unnecessary risk

C．leave her boots behind

D．walk for ten hours around the mountain小题5:In the future, Hazel wants to ________.

A．revisit volcanoes she knows

B．go on holiday to the Antarctic

C．find a less dangerous job

D．discover new things about volcanoes

欧洲封建国家改革的根本目的是

A．适应资本主义发展

B．推行重商主义政策

C．发动大规模对外战争

D．维护和加强封建统治

商品房预售人应当在签订书面预售合同之日起( )日内持预售合同到县级以上人民政府房地产管理部门和土地管理部门办理商品房预售登记备案手续。

A．10

B．15

C．20

D．30

关于速度和加速度的概念，如下说法正确的是（）

A.物体的加速度越大，速度越大

B.物体的加速度越大，速度的变化越大

C.物体的加速度为零，其速度一定为零

D.物体的速度为零，加速度不一定为零