画面由静态元件和动态元件组成。
A. 对
B. 错
If you sit in a chair ________a long time, your back may begin to hurt.
A. at
B. in
C. on
D. for
Shanghai Disneyland has started to be built and it will be open ________five years.
A. in
B. for
C. from
D. before
Harriet is lost and her parents are really ________her.
A. interested in
B. afraid of
C. busy with
D. worried about