纯碱易吸收空气中的水和二氧化碳，使其部分变成（）结块。
A、碳酸氢钠
B、一水合碳酸钠
C、七水合碳酸钠
D、十水合碳酸钠
参考答案：A
The general secretary stressed that what he had just said was only his _________view, not official intentions.
A．private
B．separate
C．personal
D．single
脊髓灰质炎后遗症可有哪些足部畸形（）
A.足内翻畸形
B.马蹄足畸形
C.马蹄内翻足畸形
D.高弓足畸形
E.锤足畸形
