练习：
1. A) on B) in C) about D) to
2. A) indicates B) indicating C) indicated D) indicate
3. A) completed B) terminated C) launched D) finished
4. A) maintaining B) maintained C) maintenance D) maintain
5. A) such a B) as such C) such that D) such
6. A) by B) on C) through D) in
7. A) which B) whether C) in which D) that
8. A) providing B) offering C) supplying D) asking
9. A) because B) therefore C) because of D) thus
10. A) satisfied B) pleased C) skeptical D) confused
11. A) less B) more C) faster D) farther
12. A) how B) which C) that D) whether
13. A) increased B) to be increased C) to increase D) increase
14. A) levied B) taken C) consumed D) removed
15. A) opaque B) transparent C) obscure D) ambiguous
答案：ABCAA ADDAC BDCAB
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