33. The study shows that some students have difficulty _______long English texts .
A) reading
B) read
C) to read
D) to be read
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34.If you __________ your mind, please call me at this number before Saturday.
A) changed
B) would change
C) had changed
D) change
任何酸(或碱)与其相应的可溶性盐都可以组成缓冲溶液。()
A. 对
B. 错
溶度积常数越大,溶解度就越大。( )
A. 对
B. 错
溶度积和溶解度都可以表示难溶电解质在水中溶解能力。( )
A. 对
B. 错