--- Whose French book is it?

--- It __________ be Lucy ’s. Look! Her name is on the book!

在越晚近的地层里成为化石的生物()

Mom asked me to _____________ grandpa when she w as out.

下列现象属于特异性免疫的是()

--- How was your vacation in Shanghai?

--- Oh, __________, I can ’t stand it.There were too many people and the weather was too hot.

计划免疫的目的是()

---Do you like this movie?

--- Yes, I do! In fact I ’ve never seen a ________ one than this.

第二性征的出现与何种激素的作用直接有关()

My father is a reporter. He works in a ___________.

近视在眼球结构上的变化是()