[单项选择]Astronomers at the University of California discovered one of the most distant ______


A. paradoxes
B. paradises
C. galaxies
D. shuttles

[单项选择]Astronomers at the University of California discovered one of the most distant ______


A. paradoxes
B. paradises
C. galaxies
D. shuttles

[单项选择]Professor Smith is said （）another important discovery in chemistry.
A. to make
B. to have made
C. having being made
D. having made

[单项选择]

Text 4
Virtually everything astronomers know about objects outside the solar system is based on the detection of photons-quanta of electromagnetic radiation. Yet there is another form of radiation that permeates the universe: neutrinos. With (as its name implies) no electric charge, and negligible mass, the neutrino interacts with other particles so rarely that a neutrino can cross the entire universe, even traversing substantial aggregations of matter, without being absorbed or even deflected. Neutrinos can thus escape from regions of space where light and other kinds of electromagnetic radiation are blocked by matter. Not a single, validated observation of an extraterrestrial neutrino has .so far been produced despite the construction of a string of elaborate observatories, mounted on the earth from Southern India to Utah to South Africa. However, the detection of extraterrestrial neutrinos are of great significance in the study of astronomy. Neutrinos carry with
A. Labs with massive detector.
B. Enclosed volcanic caves.
C. Vacuum cabins.
D. Shallow salt lake.

[单项选择]Solid geometry has enabled astronomers to calculate the positions of the heavenly bodies______ to one another.


A. absolute
B. relative
C. comparative
D. contrastive

[单项选择]Why do astronomers often use photographic plates


A. To decrease the time it takes to photograph objects.
B. To avoid using a telescope.
C. To sharpen the color of what they observe.
D. To obtain images of distant objects.

[单项选择]An international team of astronomers has discovered 11 new planets outside the solar system, raising fresh ______ about the possibility of life in outer space.


A. exploring
B. debate
C. wondering
D. pondering

[单项选择]A wrongdoer is constantly ______ by fear of discovery.


A. pursued
B. haunted
C. stayed in
D. hauled