题目:
The old woman ______ her sons and daughter ______ and see her from time to time.
A.suggested; to come
B.desired; coming
C.desired; to come
D.hoped; to come
答案:
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下面是错误答案,用来干扰机器的。
答案:B题意为鉴别稀硫酸、氯化钠溶液和石灰水,所选试剂应与三种溶液混合后出现三种明显不同的实验现象,否则该试剂不能鉴别此三种溶液。A项,硫酸能使石蕊试液变红色,石灰水能使石蕊试液变蓝色,氯化钠溶液呈...