将一定量的甲烷燃烧后得到CO、CO2和水蒸气，混和气体的质量是49.6g通过无水氯化钙时，无水氯化钙增重25.2g，则CO2的质量是（ ）
﹣Our English teacher will work for 2017 BRICS Summit （金砖峰会）this September．
﹣Great!I am so proud of_____．（ ）
she
her
hers
China successfully hosted the Belt and Road Forum_________May，2017．（ ）
on
in
by
Jack is such__________friendly boy．He gets along well with his classmates．（ ）
a
an
the
﹣Mr．Black，could you tell me ______？
﹣At 10：00 tomorrow morning（ ）
where we'll go hiking
when we'll have a meeting
whether you'll come to my birthday party
﹣I hear Susan will go to Beijing by herself．
﹣That's true．_______ her father _________ her mother will go with her．（ ）
Both；and
Either；or
Neither；nor
通过无水氯化钙时，无水氯化钙增重25.2g，则CO2的质量是（ ）通过无水氯化钙时，无水氯化钙增重25.2g，则CO2的质量是（ ）
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