单项选择题The study of Dr. Ruth Mace and Dr. Rebecca Sear shows that a child% growth may be affected ______.

单项选择题Which of the following is TRUE

单项选择题The best title for this passage could be ______.

单项选择题Speaking of Disraeli, a conventional professor would probably have ______.

单项选择题This passage is probably an excerpt from an article on ______.