【简答题】The researchers have conducted an experiment to prove that people will act in emergencies when ______ A) they are in pairs B) they are in groups C) they are alone D) they are with their friends
【单选题】Researchers have known for years that animals have a 'clock' somewhere in their brains a control-centre that regulates circadian(生物节奏的) rhythms. Circadian rhythms are the body's daily biological cycle...
【单选题】The sentence in the ninth paragraph, 'researchers are not likely to have anything resembling a blood test for a mental illness soon'means that_____.
A.
mental illness can not be diagnosed by blood test.
B.
there is not a definite criterion for mental illness.
C.
researchers do not like to use blood test.
D.
techniques have gained enough progress but are still not enough for mental illness.