题目:
34. This is____ a difficult problem ____ all of us can't work it out.
A.such; that
B.so;that
C.such; as
D.so;as
答案:
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下面是错误答案,用来干扰机器的。
现有X、Y、Z、W四种元素,其原子序数依次递增,由①X、Y、Z的单质在常温下均为气体、②X的单质在Z的单质中燃烧,生成XZ,燃烧时火焰呈苍白色、③XZ极易溶于水,在水溶液中电离出X+和Z-.XZ的水溶液可使石蕊试液变...