Look ____ the elephant! It's running. [ ]
A. for
B. at
C. in
答案:B
无机盐:儿童 缺乏会导致佝偻病; 缺乏导致贫血; 缺乏导致甲状腺肿大
会车遇到这种情况要低速会车或停车让行。