（ ）苔藓、蕨类植物、种子植物均有维管束构造，因而是高等植物。
查看答案
（ ）蕨类植物在世代交替中，其孢子体和配子体均能独立生活。
A. 对
B. 错
Direstions: use the follwing words to fill in the blanks.should, shouldn't, must, mustn't, have to, needn't
Look at the sign, you __________ throw the litter around here.
If you want to be thinner, you _______ eat less meat.
微信支付 
支付宝支付