上述实验设计的不妥之处是（    ）

如图，已知⊙O的直径AB=12cm，AC是⊙O的弦，过点C作⊙O的切线交BA的延长线于点P，连接BC．

H﹣H  436.4     Cl﹣Cl  242.7     H﹣Cl  431.8

①写出氢气在氯气中燃烧生成氯化氢气体的热化学方程式：____．

②若有1g氢气在氯气中完全燃烧，可放出热量____ kJ．

(B) 根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式。
____ I have ordered several ________(册) of this book from abroad. Would you like to have one?
____ The silk shirt feels much ___________ (光滑的) than the wool one.
____ We are not sure if the man has any criminal ______________ (记录).
____ Jim is so _______________ (幽默的) that he is always making us laugh.