[单项选择]Experiments suggest that season of birth dramatically affects the speed（）the body clock ticks.
A. at which
B. for which
C. on which
D. in which

[填空题]Scientists have done countless experiments to show that praise is far( effective )（）than criticism in improving human behavior.

[填空题]Experiments show that monkeys have language.

[单项选择]In scores of experiments, scientists are changing the genetic endowments of plants and animals, and the results could（）a revolution in farm fields, feedlots and dairy barns.
A. Spawn
B. bring
C. instigate
D. plot

[填空题]Many schools have banned experiments seen as dangerous, even though they teach (47) skills.
It is a scientific fact, tested and (48) by generations of pupils, that experiments in school laboratories win young people to the cause of science. White coats, goggles and the chance to set fire to things (49) a passion for chemistry that even years of examinations do not (50) .
But government advisers and scientists are warning of a disturbing development that could endanger generations of future scientists: pupils are no longer allowed to experiment.
Health and safety concerns are preventing students — including those taking A levels — from (51) vital and exciting investigations into what happens when one sets fire to magnesium(镁) ribbon, or drops a small glob of sodium(钠) into a dish of water.
The fear of burns and volatile reactions means that even ordinary procedures such as distillation are often viewed online r

[单项选择]Those experiments have laid a solid foundation for his （　） research in material science.
A. far
B. deep
C. farther
D. further

[填空题]Experiments in which animals live in artificial surroundings show that

[单项选择]What does the speaker suggest
A. Trying hard to memorize grammar rules.
B. Trying your best to memorize more words.
C. Listening to songs in the foreign language.

[单项选择]What does the man suggest
A. Getting up. earlier.
B. Making an appointment.
C. Going to the bookstore.
D. Not going to school.

[单项选择]What does the woman suggest
A. That the man rethink their plans.
B. That the man see a family doctor.
C. That the man see a psychiatrist.
D. That the man concentrate on his studies.