选择合适的答语
⑴What's the weather like in Beijing ?____         A、It's rainy
⑵What time is it ?____                                       B、It's eleven o'clock
⑶Is it hot ?____                                                  C、Yes , it is .
⑷Whose English book is this ?____                   D、It's on the third floor .
⑸Where's the music room ?____                       E、It's Wang Qiang's .

She ______ your birthday. But she had to put work first.

某同学根据下图所示溶解度曲线获得以下信息，其中正确的是（ ）

1874年22岁的范特霍夫和27岁的勒贝尔分别提出碳正四面体学说，建立了分子的立体概念．如图所示均能表示甲烷的分子结构，哪一种更能反映其真实存在状况（   ）

天然培养基是利用成分很复杂的天然物质配制而成的。合成培养基则是采用成分已知的化学试剂配制而成的。下列说法中正确的是 （   ）