I've made an ______ for you to see the dentist at 5 o'clock tomorrow.
A. interview
B. opportunity
C. appointment
D. occasion
查看答案
We wrote to them last week and ____ them to reply in the next few days.
A. expected
B. hoped
C. waited
D. looked forward to
The meeting had to be ____ because of the absence of chairman of the board.
A. called out
B. called off
C. called on
D. called up
Bicycling is good exercise;______, it doesn't pollute the air.
A. however
B. moreover
C. therefore
D. otherwise
真核生物mRNA生物合成的叙述正确的是
A. 5'端加帽，3'端加poly A尾
B. 与蛋白结合形成核糖体
C. 剪除外显子，连接内含子
D. 3'端加CCA序列
E. 三叶草型结构
微信支付 
支付宝支付