消防安全通用绳绳发现问题立即停用，不能维修和剪接。

（1）A、B、C是三个完全相同的时钟，A放在地面上，B、C分别放在两个火箭上，以速度v_b和v_c朝同一方向飞行，v_b＞v_c。在地面上的人看来，关于时钟快慢的说法正确的是 ▲  

A．B钟最快，C钟最慢

B．A钟最快，C钟最慢

C．C钟最快，B钟最慢

D．A钟最快，B钟最慢（2）如图所示，实线是一列简谐横波在t₁= 0时的波形图，虚线为t₂=0.5s时的波形图，已知0＜t₂－t₁＜T，t₁= 0时，x=2m处的质点A正向y轴正方向振动。

①波速大小为    ▲   ；

②从t₂时刻计时，x=1m处的质点的振动方程是   ▲  。

（3）如图所示，半圆玻璃砖的半径R=10cm，折射率为n=，直径AB与屏幕垂直并接触于A点．激光a以入射角i=30°射向半圆玻璃 砖的圆心O，结果在水平屏幕MN上出现两个光斑．求两个光斑之间的距离L．

下列关于茵陈的描述正确的是（）

A.来源于菊科植物滨蒿

B.来源于菊科植物黄花蒿

C.来源于菊科植物茵陈蒿

D.于春季幼苗高6~10cm时采收称为"绵茵陈"

E.于秋季花蕾长成至花初开时采割的称为"花茵陈"

GUATEMALA CITY （Reuters） – A fish that lives in mangrove swamps(红树沼泽) across the Americas can live out of water for months at a time, similar to how animals adapted(适应) to land millions of years ago, a new study shows.

The Magrove Rivulus, a type of small killifish, lives in small pools of water in a certain type of empty nut or even old beer cans in the mangrove swamps of Belize, the United States and Brazil. When their living place dries up, they live on the land in logs(圆木), said Scott Taylor, a researcher at the Brevard Endangered Lands Program in Florida.

The fish, whose scientific name is Rivulus marmoratus, can grow as large as three inches. They group together in logs and breathe air through their skin until they can find water again.

The new scientific discovery came after a trip to Belize.

“We kicked over a log and the fish just came crowding out,” Taylor told Reuters in neighboring Guatgemala by telephone. He said he will make his study on the fish known to the public in an American magazine early next year.

In lab tests, Taylor said he found the fish can live up to 66 days out of water without eating.

Some other fish can live out of water for a short period of time. The walking catfish found in Southeast Asia can stay on land for hours at time, while lungfish found in Australia, Africa and South America can live out of water, but only in an inactive state. But no other known fish can be out of water as long as the Mangrove Rivulus and remain active, according to Patricia Wright, a biologist at Canada’s University of Guelph.

Further studies of the fish may tell how animals changed over time.

“These animals live in conditions similar to those that existed millions of years ago, when animals began making the transition(过渡) from water onto land,” Wright said.

1. The Mangrove Rivulus is a type of fish that _______.

A. likes eating nuts

B. prefers living in dry places

C. is the longest living fish on earth

D. can stay alive for two months out of water

2. Who will write up a report on Mangrove Rivulus?

A. Patricia Wright.

B. Scott Taylor.

C. Scientists from Belize.

D. Researchers in Guatemala.

3. According to the text, lungfish can ________.

A. breathe through its skin

B. move freely on dry land

C. remain alive out of water

D. be as active on land as in water

4. What can we say about the discovery of Mangrove Rivulus?

A. It was made quite by accident.

B. It was helped by Patricia Wright.

C. It was based on a lab test of sea life.

D. It was supported by an American magazine.

继发性腹膜炎的腹痛特点是

A．高热后全腹痛
B．剧烈、持续性全腹痛，原发部位显著
C．腹痛伴肠鸣音亢进
D．逐渐加重的阵发性腹痛
E．阵发性全腹绞痛

备案号（）。

A．GD-98-23757

B．983057

C．C22044800205

D．0209576