[单项选择](The more straighter) the sun's rays shine down (upon) the earth, (the more heat) they give to the part of the earth (they touch).
A. The more straighter
B. upon
C. the more heat
D. they touch

[单项选择](The more straighter) the sun's rays shine down (upon) the earth, (the more heat) they give to the part of the earth (they touch).（）
A. The more straighter
B. upon
C. the more heat
D. they touch

[单项选择]All the creatures depend on the sun's rays for the light and warmth which （） us alive.
A. keeps
B. keep
C. kept
D. is keeping

[单项选择]We depend on the sun's rays. for the light and warmth which （） us alive.
A. keep
B. keeps
C. kept
D. is keeping

[单项选择]Without air protection, the sun's rays______.
A. will become very cold
B. will do good to human beings
C. will become hot
D. will do harm to human beings

[单项选择]X-rays are also called Rontgen rays ______ the discoverer who first put them to use.
A. in case of
B. in view of
C. in place of
D. in honor of

[单项选择]According to the passage, as the corona rays reach the planets, they become______.
A. hotter
B. clearer
C. thinner
D. stronger

[单项选择]

Sparks created in a lab give off X-rays, scientists announced Monday.
X-rays are a byproduct (副产物) of high-energy electron discharges in the Sun, in exploding stars, and even in lightning. Many scientists did not expect sparks alone to do the trick.
Researchers at Florida Institute of Technology brought their equipment, which had detected X-rays in lightning, into the lab. Half the team expected to see X-rays and the other half did not.
In sparks of 1.5 million to 2 million volts, the researchers indeed recorded X-rays that were remarkably similar to those produced by lightning.
"This amazed us, It opens the door to answering really big questions about lightning by generating it in the lab," said team member Hamid Rassoul. "It also tells us that we have a lot’ to learn about how even small sparks work."
X-rays are a form of electromagnetic radiation, on a spectrum (频谱) that runs from radio waves on the low
A. making sparks in laboratory
B. discharges of high-energy electron in the Sun, in exploding stars, and in lightning
C. electrons escaping their normal connections
D. radio waves