农业企业在筹措资金时。既要避免因资金筹集不足，影响生产经营的正常进行;又要防止资金筹

黑膏药处方中的可溶性或挥发性药物应何时加入？（）

A.药物提取时

B.炼油过程中

C.摊涂前加入已熔化的膏药中

D.下丹时

C

If you gaze（凝视）through a telescope at a distant galaxy（星系）, it may glow brightly with the light of hundreds of millions of stars. Despite（尽管，不顾） all that light, most scientists think that at the center of a big galaxy lies something very dark: a black hole. A black hole is a region of space with gravity so strong that nothing can escape, not even light.

Astronomers recently announced they had observed a faraway galaxy that may have at its center two black holes, very close together. Based on their observations, the stargazers suspect one of the black holes has more mass than the other. The more mass something has, the stronger its gravitational force, so a larger black hole has a stronger gravitational attraction. The smaller black hole orbits（作轨道运行） the larger black hole, just as the earth orbits the sun.

The biggest galaxies in the universe form when two smaller galaxies collide（碰撞）. If  two galaxies merge（合并）, then all of their stars start orbiting a common center. The black holes at the galaxies’ centers should come together, too. Galaxies are colliding all the time, so we should be able to find lots of black hole pairs. But that’s easier said than done—astronomers rarely find these in deep space.

To find a black hole is complicated. A black hole doesn’t produce any light, so how can you find one in space? Astronomers think when something (like dust) falls into a giant black hole, a jet of radiation, a form of energy, may stream away. If this radiation is strong enough, it forms a quasar（类星体）.

The Arizona astronomers looked at more than 17,000 quasars and finally found a galaxy that may have a double black hole at its heart. Though the finding of their research is still unconfirmed, and they may be mistaken, the truth will be revealed in the future.

63. Which of the following is TRUE about black holes?

A. A black hole is a region in galaxies with nothing in it, even a bunch of light.

B. Black holes are used by astronomers to study how quasars come into being.

C. When different galaxies meet in space, the black holes become bigger and bigger

D. Some scientists think there’s one black hole in a galaxy, but others think there’re two.

64. From the second paragraph we can infer that ________.

A. a larger black hole pushes a smaller black hole away

B. a larger black hole pulls a smaller black hole toward it

C. the places of black holes are fixed, so we can see them clearly

D. a smaller black hole moves around a larger one because of radiation

65. According to the passage, astronomers think that there should be many black hole pairs because____________.

A. a black hole can produce light

B. black holes can attract one another

C. different black hole pairs come into being with the meeting of galaxies.

D. a big black hole can usually be divided into two small black holes

患者，男，25岁，前胸部暗红色丘疹，数年内逐渐扩大连接为片状斑块，暗红色，质地坚韧，表面光滑无毛，病程慢性，偶有痛痒感。

与本病的发生无关的是（）

A.遗传

B.创伤

C.物理性刺激

D.性别

E.手术

大量咯血常见于 ( )

A．支气管扩张
B．大叶性肺炎
C．支气管胸膜瘘
D．支原体肺炎
E．急性肺水肿

简述人力推矿车时必须遵守的速度规定。