问题
选择题
The young _____ has more than 30 _____. [ ]
A. inventor, inventions
B. inventor, inventors
C. inventions, inventor
D. invented, inventor
答案
答案：A
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The young _____ has more than 30 _____. [ ]
A. inventor, inventions
B. inventor, inventors
C. inventions, inventor
D. invented, inventor
答案：A
、
、
和
四种溶液（不考虑他们之间的相互反应）的试剂组是 （ ）
盐酸、氢氧化钠溶液