L1：
Lecture 1
第一题
What is the main purpose of the lecture?
ATo contrast the functions of probiotics and antibiotics
BTo describe some ways that bacteria contribute to human healt
CTo describe some differences between beneficial and harmful bacteria
DThe explain the relationship between bacteria and vitamins
第二题
The professor mentions research findings on the number of bacterial cells in the human body. What is her opinion of these findings?
AShe is confused by the inconsistency of the various findings.
BShe accepts the validity of the findings.
CShe expects that future research wilt show that the estimates are too high.
DShe regrets that researchers did not include counts of bacteria in the digestive system.
第三题
According to the professor, what are the main functions of beneficial bacteria that normally live in the digestive system?
Select 3 answers
AThey help the body process complex carbohydrates.
BThey consume the bacteria that cause digestive problems.
CThey produce some vitamins that the body cannot make on its own.
DThey slow down the absorption of proteins.
EThey prevent bad bacteria from obtaining enough nutrients.
第四题
What does the professor imply about the use of antibacterial soap?
AIt may increase the risk of an infection.
BIt is not very effective in killing bacteria.
CIt is effective only if used on a regular basis.
DIt provides the skin with an added layer of protection.
第五题
What point does the professor make about the bacteria present in yogurt?
AThe bacteria can cause sickness in some people.
BThe bacteria in some yogurt brands are difficult to digest.
CLive bacteria are not present in all yogurt brands.
DThe bacteria act like an antibiotic in the digestive system.
第六题
What does the professor imply about probiotics?
Select 2 answers
AThey can help fix problems caused by antibiotics.
BThey will eventually replace antibiotics.
CThey probably cause more harm than good.
DEvidence is lacking for certain claims about probiotic supplements.
