单项选择题

Which of the following was the cause of cold weather in England from 1815 to 1818

A．England's proximity to the North Sea.
B．Volcanic ash in the atmosphere.
C．Floods in the area.
D．Pollution caused by the Industrial Revolution.
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单项选择题
According to the passage, which of the following is required for lactation
A．Fat storage.
B．Iron and calcium.
C．Increased blood supply.
D．A well-nourished placenta.
单项选择题
According to the passage, what traditional belief has been questioned
A．The fetus grows at the expense of the mother.
B．Good nutrition is necessary throughout pregnancy.
C．The most important changes occur in early pregnancy.
D．The mother's nourishment is more important than the baby's.
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