A：充分而不必要条件
B：必要而不充分条件
C：充要条件
D：既不充分也不必要条件
已知集合A={x|3≤3x≤27}，B={x|log2x＜1}
（1）分别求A∩B，A∪B
（2）已知集合C={x|1＜x＜a}，若C⊆A，求实数a的取值范围．
线形动物比扁形动物复杂而且高等的地方是（ ）
选出合适的应答语。
A. You should go to bed early.
B. You should wear a sweater.
C. She should tell the teacher and go to see the doctor.
D. You should tell your mother.
E. You should take it to see the vet.
F. You should help her do some chores.
