下列哪项提示8个月婴儿发育可疑迟缓（）
A.不会抓物
B.不会乱画
C.不会用勺
D.不会画直线
E.不会拇、示指取物
参考答案：A
为防止分子筛发生进水事故，在操作中应注意哪些？
British "structuralism" linguists believed that elements in a language were ______, that is, lower level systems of word classes led to higher level systems of phrases and sentences.
A. classified B. rule-governed C. varied D. leveled
