细胞胞吞作用特征是 ( )。
A. 形成衣被小泡
B. 受体介导
C. 需要消耗ATP
D. 需要钙离子调控
E. 需要细胞膜电位改变
Choose the best answer.Until now, we have raised 50,000pounds for the poor children, is quite unexpected.
A. that
B. which
C. who
D. it
I borrow the bookSherlock Holmesfrom the library last week, my classmates recommended to me.
A. who
B. which
C. when
D. where
The exact year Angela anf her family spent together in China was 2008.
A. when
B. where
C. why
D. which