【名词&注释】
碳酸钠(sodium carbonate)、碳酸氢钠(sodium bicarbonate)
[单选题]43________.
A. necess
B. gas
C. rest
D. water
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举一反三：
[单选题]What was the normal price of the T-shirt?
A. $15
B. $30.
C. $50.
[单选题]现有等浓度的下列溶液：①醋酸，②苯酚，③苯酚钠，④碳酸，⑤碳酸钠，⑥碳酸氢钠。按溶液pH由小到大排列正确的是
A. ④①②⑤⑥③ B． ④①②⑥⑤③
B. ①④②⑥③⑤ D． ①④②③⑥⑤
[单选题]Ben did not rush in help Mrs. Tailor because_____
A. he thought that she could be necking them
B. he knew that they could not have been in the tree
C. he did not the old lady fall down
D. he was afraid of the three-legged cat
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