On the night of July 6,1943, a plane took off from an Air Force base in England to stop German fighters over the English Channel. Piloting the plane was Captain Thomas Nash. Looking westward, Nash saw twelve orange lights in a row, moving at a very high rate of speed. Thinking they might be a new German weapon(武器),he swung the plane around and headed directly for the lights, but they disappeared.

　　   Captain Nash may have been the first to see such orange lights but he wasn’t the last. His experience was repeated many times by pilots during World War Ⅱ both in Europe and Far East.

　　   What were they? No one knows for sure, but there is an interesting theory to explain them. According to this theory, the orange lights are space animals---animals specially adapted to(适应于)life in the upper atmosphere just as some living things are adapted to life at the bottom of the sea.

　　   These space animals, the theory says, live so far up in the atmosphere that they are not in sight from the earth. They feed partly in the air and partly on energy from the sunlight. Being almost pure energy themselves, their bodies can shine at night. During the day they became invisible.

　　   Before World War Ⅱ, continues the theory, there was little radiated energy on the earth’s surface. Then came the development of rockets, nuclear power stations and something like that. The space animals are attracted to these kinds of energy of food. At night when there is no energy from the sunlight, they come down into the lower levels in search of a meal. They may even float into the range(范围)of human eyesight. This explains the fact that they have been sighted many times from the earth since 1943.

1. The main idea of this passage is that 　　  .

A. Captain Nash saw twelve orange lights traveling at a great speed

B. Captain Nash may have been the first to see lights in space

C. the orange lights are space animals according to a theory

D. the secret of nature can all be fully explained

2. The theory says that during the daytime the space animals

A. shine brightly in the sky

B. cannot be seen

C. can be in sight now and then

D. visit the earth’s surface

3. If the space animal theory is correct, the orange lights come down to the lower levels in order to 　　  

A. escape from the atmosphere

B. get the energy from the sun

C. search for man-made energy

D. produce the energy they need

4. The space animal theory would seem to suggest that 　　  .

A. living things are extremely adaptable

B. life in space is impossible for man

C. the earth is more suitable for these space animals

D. life cannot exist in the upper atmosphere

　　   Captain Nash may have been the first to see such orange lights but he wasn’t the last. His experience was repeated many times by pilots during World War Ⅱ both in Europe and Far East.

　　   What were they? No one knows for sure, but there is an interesting theory to explain them. According to this theory, the orange lights are space animals---animals specially adapted to(适应于)life in the upper atmosphere just as some living things are adapted to life at the bottom of the sea.

　　   These space animals, the theory says, live so far up in the atmosphere that they are not in sight from the earth. They feed partly in the air and partly on energy from the sunlight. Being almost pure energy themselves, their bodies can shine at night. During the day they became invisible.

　　   Before World War Ⅱ, continues the theory, there was little radiated energy on the earth’s surface. Then came the development of rockets, nuclear power stations and something like that. The space animals are attracted to these kinds of energy of food. At night when there is no energy from the sunlight, they come down into the lower levels in search of a meal. They may even float into the range(范围)of human eyesight. This explains the fact that they have been sighted many times from the earth since 1943.

1. The main idea of this passage is that 　　  .

A. Captain Nash saw twelve orange lights traveling at a great speed

B. Captain Nash may have been the first to see lights in space

C. the orange lights are space animals according to a theory

D. the secret of nature can all be fully explained

2. The theory says that during the daytime the space animals

A. shine brightly in the sky

B. cannot be seen

C. can be in sight now and then

D. visit the earth’s surface

3. If the space animal theory is correct, the orange lights come down to the lower levels in order to 　　  

A. escape from the atmosphere

B. get the energy from the sun

C. search for man-made energy

D. produce the energy they need

4. The space animal theory would seem to suggest that 　　  .

A. living things are extremely adaptable

B. life in space is impossible for man

C. the earth is more suitable for these space animals

D. life cannot exist in the upper atmosphere