The tour guide should get on the bus firstly and count the number of tourists.
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以Tim为主语,read a book 为谓语,依序写出12个时态的句子。例如:(1)一般过去时 Tim read a book.(1)一般过去时 _______________________________________________________(2)一般现在时_______________________________________________________(3)一般将来时_______________________________________________________(4)过去进行时_______________________________________________________(5)现在进行时_______________________________________________________(6)将来进行时_______________________________________________________(7)过去完成时_______________________________________________________(8)现在完成时_______________________________________________________(9)将来完成时_______________________________________________________(10)过去完成进行时_______________________________________________________(11) 现在完成进行时_______________________________________________________(12) 将来完成进行时_______________________________________________________
Read the passage and find out the periods of Google's histroy for the following important events.
影响病原物侵入寄主的环境条件主要是()
A. 温度
B. 湿度
C. 营养物质
D. 光照