[填空题]The rat experiment was conducted to show that A certain species of rat are more intelligent than others. B intelligent rats are more motivated than ’dull’ rats. C a rat’s surroundings can influence its behaviour. D a boring environment has little impact on a ’bright’ rat.

[填空题]The rat experiment was conducted to show that a rat’s surroundings can influence its ______.

[单项选择]Our experiment was conducted under optimal conditions. The underlined part means ________.
A. perfect
B. proper
C. possible
D. proposed

[填空题]The researchers have conducted an experiment to prove that people are more likely to act in emergencies when ______.

[单项选择]Before the experiment A the four divisions were carefully selected to suit a specific programme. B each division was told to reduce its level of productivity. C the staff involved spent a number of months preparing for the study. D the employees were questioned about their feelings towards the study.

[单项选择]

An experiment that some hoped would reveal a new class of subatomic particles, and perhaps even point to clues about why the universe exists at all, has instead produced a first round of results that are mysteriously inconclusive.
Dr. Conrad and William C. Louis presented their initial findings in a talk yesterday at the Fermi National Accelerator Laboratory where the experiment is being performed.
The goal was to confirm or refute observations made in the 1990s in a Los Alamos experiment that observed transformations in the evanescent but bountiful particles known as neutrinos(微中子). Neutrinos have no electrical charge and almost no mass, but there are so many of them that they could collectively outweigh all the stars in the universe.
The new experiment has attracted wide interest. That reflected in part the hope of finding cracks in the Standard Model, which encapsulates physicists’ current knowledge about fundamental particles and forces.

A. most of the data in the Los Alamos experiment is not accurate.
B. the number of times one flavor of neutrino converts into another.
C. there is some subtler interplay of particles causing miscalculations.
D. the number of neutrinos is more than estimated at the higher energies.