已知三角形两边长分别为3cm，5cm，设第三边为xcm，则x的取值范围是______．
3+5=8，5-3=2，
∴x的取值范围为：2cm＜x＜8cm．
______与37互为倒数．
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
