【单选题】

Drinking a little alcohol during pregnancy is just fine for most women, found a new study.

"Heavy drinking has been (31) for a long time with difficulties for mothers and the children born to them," said lead researcher Yvonne Kelly. " However, there hasn’t been a (32) research to look at the lower end of the drinking range," she addeD、
The study, which found no (33) of harm for pregnant women from having (34) drinks a week, was so well done and its findings (35) conclusive that it ought to become the final word in the (36) said FredBookstein, a researcher who studies alcohol (37) He hopes that research dollars can now go towards finding the effects of more (38) chemicals.
In the United Kingdom, mothers (39) to have a relatively relaxed attitude toward alcohol during pregnancy. (40) a third of pregnant women report drinking at least some alcohol, Kelly said, (41) a natural experiment to look at how levels of drinking (42) children later on.
When the babies were 9 months old, morns were asked to describe how much alcohol they had (43) during pregnancy. Then, the babies took a series of tests that evaluated their behavioral, (44) and intellectual development. The kids took similar tests at age three and again at age five.
Final results of the study agreed (45) previous work that children born to heavy drinkers do worst on developmental tests, because excessive (46) to alcohol in the womb kills nerve cells and causes brain damage.
But the study found no evidence (47) light drinking during pregnancy causes emotional or learning problems in children (48) the age of five. In some tests of vocabulary and pattern creation, (49) , boys actually did best if their morns drank a little while carrying them. The findings (50) what the researchers had found when the kids were three years olD、
A．however
B．for example
C．in addition
D．though