课后作业第一题答案
1、planets
2、also
3、alone
4、part
5、Light
6、air
7、environment
8、cost
9、grew
10、prefer
课后作业第二题答案
1 | 2 | 3 | 4 | 5 |
D | C | B | D | B |
课后作业第三题答案
1、there has ever been
2、far away;for many years
3、have sent
4、has gone to;on
5、more information
课后作业第四题答案
1 | 2 | 3 | 4 | 5 |
A | B | B | D | D |
6 | 7 | 8 | 9 | 10 |
D | B | A | C | D |