2、怎样写单质的化学式?
1、纯净物和混合物有什么不同?纯净物都有固定的组成吗?能否用元素符号来表示纯净物?
116. It rained heavily,____ the basketball match had to be put off.
A. so that B. when C. otherwise D. therefore
115. You must work hard,____ you will not learn English well.
A. if B. whether C. otherwise D. unless
114. The book is not easy.____ it's rather difficult.
A. On the one hand B. On the contrary
C. On the other hand D. On the other contrary
113. He spoke loudly ____ the audience could hear him clearly.
A. so B. that C. so that D. in order to
112.I don' t know ____ to stay at home or go out.
A. whether B. if C. how D. where
111.____ he will come or not is still unknown.
A. If B. Where C. That D. Whether
110. He will come ____ you ask him.
A. whether B. unless C. if D. while
109. Everything around us is ____ solid ..liquid ____ gas.
A. not .. .but... either.. .nor... D. whether.. .or...
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