刀补取消过程，刀补终点与取消刀补点之间的（）应大于一个刀具半径。

青年女性，闭经3个月， * * 不规律出血，血块中夹有水泡。检查发现子宫体积大， * * 壁有暗紫色结节、出血、坏死。最大可能是

A．宫外孕
B．葡萄状肉瘤
C．葡萄胎
D．恶性葡萄胎
E．绒毛膜癌

计算某年围产儿死亡率的分母是（）

A.活产数

B.出生7天内婴儿数

C.围生期的死胎数+活产数

D.围生期的死产数+活产数

E.围生期的死胎数+死产数+活产数

非正式沟通有何特点？管理者应该如何对待组织中的非正式沟通？

As many as 60,000 people worldwide die each year from too much sun, but simple safety steps could prevent many deaths, according to a World Health Organization report.

The report, released on Wednesday, was treated as the first overall look at the global health burden from UV radiation, which is linked to up to 90 percent of melanoma（恶性黑色素瘤） and other skin cancers. UV radiation can also cause sunburn, more rapid skin aging, eye diseases, and reactivation of the herpes（疱疹） virus that causes cold sores, and pterygium, a fleshy growth on the surface of the eye.

“We all need some sun, but too much sun can be dangerous—and even deadly,” said Dr Maria Neira, the director of WHO’s agency of public health and the environment, who released the report.

To prevent cancer and other diseases linked to UV radiation, the agency recommends that people:

— Limit time in the midday sun.

— Use shade wisely and seek shade when UV rays are most intense.

— Wear protective clothing, hats and sunglasses.

— Use sunscreen with a sun protection factor 15+.

— Avoid sunlamps and tanning parlours.

People under age 18 should not use them at all.

“The application of sunscreens should not be used to prolong sun exposure but rather to protect the skin when exposure is unavoidable,” the report warned.

The report also noted that the ground’s surface can make a difference:

— Fresh snow reflects as much as 80 percent of ultraviolet light.

— Sea foam reflects about 25 percent.

— Dry beach sand reflects about 15 percent.

Small amounts of exposure to the sun help the skin to produce vitamin D.

48. The report was highly spoken of mainly because ____.

A. it had listed up to 60,000 deaths from UV radiation

B. it related the deaths to UV radiation

C. it showed the advantages and disadvantages of UV

D. it found out the approaches to preventing deaths from UV radiation

49. According to Dr Maria Neira, which of the following is TRUE?

A. In fact we need only a small amount of sunlight.

B. Receiving large amounts of sunlight will cause deaths.

C. Midday sunlight has stronger UV radiation.

D. Melanoma will disappear if we follow the report’s advice.

50. As a construction worker, it is strongly recommended that ____.

A. he should stay inside the building                 B. he spread sunscreen on the face

C. he should wear good sunglasses                           D. he be equipped with sun protection

51. Which of the following can be the headline of the passage?

A. UV—A Deadly Killer From The Sun               B. Melanoma Can Be Prevented Today

C. UV—A Great Need For Vitamin D                   D. Teenagers Mustn’t Stay Outside

在下面一段文字中的横线处依次填入关联词语，最恰当的一组是( )。 我们到了脑筋疲倦的时候，往往随意地将课本以外的书籍取来阅读，_________这书籍就成了常和我们亲近的一种消遣品。____________我们________以它当作消遣品，没有什么关系，也就没有严格的选择。________，这书籍“刺激神经”、“扰乱思想”的进程比剧场、游艺园更要高些，力量也就大些。

A．那么因而虽然然而

B．那么因而虽然否则

C．因此虽然因为然则

D．因此因为既然然而