题干
The farmers needed________agricultural technology. Therefore, ________skilled workers were sent there.
A：a great number of, a large amount of
B：large amounts of, the number of
C：a large amount of, a great number of
D：the amount of, a great number of
答案(点此获取答案解析）
C
）分别和氢氧化钠的醇溶液混合加热，则