下列地理事物由于板块张裂拉伸，面积不断缩小的是[ ]
A．东非大裂谷
B．红海
C．大西洋
D．太平洋
答案：D
为每种药品选择适宜用药时间的依据是
A．血浆半衰期
B．病情
C．药物作用机制的特点
D．疗效
E．剂型
根据首字母提示和中文意思，写出单词的正确形式。
1. It's ________ (必要的) for us to learn English well.
2. He can’t ________(解答) the problem at all.
3. The Greens will have a ________(令人愉快的) trip because they plan everything carefully.
4. There are many places of i________ in Suzhou.
5. Lu Xun is one of the most famous w________ in China.
